Chapter 18: Breasts & Axillae

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Welcome back to the Deep Dive.

Today,

we're doing things a bit differently.

A little more focused.

Yeah, exactly.

Instead of a big broad topic, we're getting really specific.

We're taking one single chapter 18 from Bates Guide to Physical Examination, and we're just going to pull it apart piece by piece.

And we're talking about the examination of the breasts and axillae.

We are.

And I know that might sound, well, maybe a little niche.

But it's not.

For anyone who is a student in the health professions, you know, med students, nursing students,

even if you're already practicing, this is one of the most,

I'd say high stakes physical exams you can do.

It really is.

And let's be honest, it's one of the exams that probably causes the most anxiety for learners.

Oh, without a doubt for everyone involved.

Right.

There's the intimacy of it, which is, you know, that's one layer of nervousness for students.

But then there's the clinical weight.

You are literally with your fingertips feeling for cancer.

That's a heavy, heavy burden.

It is, especially when you're just starting and you don't trust your hands yet.

And that's the feedback we hear all the time.

Students feel like they're just sort of rubbing around without a map.

They don't really know what they're supposed to be feeling for.

So that's our mission today.

We want to give you that map.

We're not bringing in any outside opinions.

No, you know,

in my practice, I do this.

We are sticking 100 % to the Bates text.

We're going to decode the anatomy, the physiology and the very specific mechanics of how to do this exam properly.

We're going to build it from the ground up.

So anatomy first, then the health history questions, then the physical exam itself, and we'll wrap up with the health promotion and screening guidelines.

And understanding the why behind it all is just so crucial.

I mean, if you don't get the lymphatic drainage, the plumbing of the system, really, you won't understand how and where cancer spreads.

And if you don't understand the hormonal cycles, you're going to mistake completely normal tissue for a dangerous tumor.

It's all connected.

OK, so let's start with the absolute basics.

The boundaries, the territory.

When someone says breast exam, I think most people just picture the breast mound.

But clinically, it's a much bigger area.

Much, much bigger.

Bates lays out a very specific rectangle that you are responsible for examining.

It is not just the tissue that fits in a bra cup.

So what are the landmarks?

OK, so vertically, you're starting up at the clavicle, the collarbone and the second rib.

And you're going all the way down to the sixth rib.

So pretty much from the collarbone down to where the bra line would be.

Roughly, yes.

And then horizontally, you're going from the sternum, that's the breastbone, right in the middle of your chest, all the way across to the mid axillary line.

And the mid axillary line is what?

The very middle of the armpit.

Correct.

Smack dab in the middle of the armpit.

So when you picture that, it's a massive surface area you have to cover.

And it's not just floating there.

What's underneath it?

Right.

You have to visualize what it's sitting on.

It's basically plastered onto the chest wall.

The big muscle underneath is the pectoralis major.

But then sort of at the bottom and out toward the sides, it's also sitting on another muscle called the serratus anterior.

So why does that backdrop of muscle matter to me when I'm doing the exam?

Because you use it.

You actively use it.

Later on, when we get to the exam maneuvers, we're actually going to have the patient contract those muscles.

Ah, I see.

And if a mass, a lump is stuck to that muscle, it's not going to move when the muscle flexes.

That's what we call fixation.

And it's a really concerning sign for malignancy.

You need that backdrop to test against.

Okay.

So we've got the canvas defined.

Let's talk about what's actually inside the breast.

The tech splits it into three types of tissue, right?

Glangular, fibrous, and adipose.

Yeah.

Let's start with the glandular part.

The easiest way to picture it is like the spokes of a wheel.

You've got about 15 to 20 lobes that are all arranged radially around the nipple.

So they're all pointing towards the center.

They're all pointing towards the nipple.

And those lobes drain into what are called lactiferous ducts and sinuses, which are the little tubes that eventually open up right on the surface of the nipple.

And what's inside the lobes themselves?

That's where the real work happens.

Inside each lobe are the lobules.

Bates says there are 20 to 40 lobules per lobe.

And these contain the tiny glands that actually make the milk.

Okay.

So that's the functional part.

What holds it all together?

That would be the fibrous connective tissue.

And there's one part of this that is so important to understand.

They're called the suspensory cooper ligaments.

Cooper ligaments.

That sounds important.

It is.

Think of them like structural cables or puppet strings inside the breast.

They're these fibrous bands that run through all the tissue and they attach directly to the skin.

Their job is to hold the breast up.

And this is where the anatomy connects directly to a sign of cancer, isn't it?

This is a huge aha moment for students.

It's the whole reason we look for dimpling of the skin.

Okay.

Explain that.

If a cancer starts to grow, it doesn't just push things aside.

It invades grows into these Cooper ligaments and it shortens them.

It pulls on them.

Like pulling on that puppet string.

Exactly.

And since that ligament is attached directly to the skin, that pulling creates a visible pucker or a dimple on the surface.

Wow.

So dimple isn't just some random skin thing.

It's a sign that something deep inside is tethered and pulling.

That's it.

Exactly.

And then, you know, surrounding all of this architecture, the lobes, the ligaments is the adipose tissue, the fat.

That's what gives the breast most of its bulk and its shape.

Okay.

Let's zoom in even closer to the nipple and areola.

Bates gets very specific about what you see on the surface.

Yeah.

If you look closely at the areola, you'll see these little sort of rounded bumps.

Those are Montgomery glands.

Montgomery glands.

They're just sebaceous glands.

They make an oily substance that helps lubricate the nipple, especially during lactation.

But there's a physiological reflex here that trips up a lot of new learners.

The nipple and areola are packed with smooth muscle.

Which means they react when you touch them.

They react very strongly.

When you go to examine the nipple, just the tactile stimulation from your fingers will cause that smooth muscle to contract.

The nipple will get smaller, firmer, more erect.

The areola might even look like it's puckering or wrinkling.

And students might mistake that for a mass.

They do.

Bates makes a point to warn you, this is not a sign of disease.

Don't mistake this normal reflex for some kind of underlying mass or attraction.

Good to know.

And while we're talking about surface anatomy, we should probably mention the milk line.

Yes.

This is a little trip back to embryology.

When we're embryos, we all have this thickened ridge of skin called the milk line that runs from our armpit all the way down to the groin.

And sometimes remnants persist.

Remnants persist.

People can have what are called supernumerary nipples basically, extra nipples anywhere along that line.

And they usually just look like a common mole, right?

Often, yeah.

They can be mistaken for a mole.

Just a small dark spot, maybe a tiny little nubbin of tissue.

Bates says they usually have no pathological significance at all.

But sometimes they can have glandular tissue.

That's the key.

If they do have glandular tissue associated with them, they can actually swell up and get tender during menstruation or pregnancy, just like a normal breast.

You can imagine how confusing that would be for a patient if they don't know what it is.

Absolutely.

Okay, so we've examined the surface.

Now we need a way to communicate what we find, a coordinate system.

The text talks about the quadrant method.

This is the standard language of the breast exam.

It's simple.

You just imagine a cross horizontal and vertical lines running right through the nipple.

And that gives you four quadrants.

Right.

The upper outer, upper inner, lower outer, and lower inner quadrants.

But Bates emphasizes that there's really a fifth area, and it seems to be maybe the most important one for screening.

It is arguably the most important.

It's called the tail of Spence.

The tail of Spence.

It's this tail of breast tissue that extends from that upper outer quadrant, laterally, and goes deep up into the axilla, into the armpit.

So wait, breast tissue actually extends into the armpit?

It does.

And this is so, so vital because a huge percentage of breast cancer, some studies say over 50%, occur right in that upper outer quadrant in this tail of Spence.

That's a staggering number.

It is.

And it means if you only examine the round mound of the breast, and you forget to reach all the way up into the axilla to check that tail, you are missing the highest yield real estate for finding cancer.

That is a sobering thought.

And for more precision, we can use the clock method too.

Yes, exactly.

Saying upper outer quadrant is still a pretty big area, but saying you found something at three o 'clock, two centimeters from the nipple.

Now that's a precise location anyone can find.

Before we move on from anatomy, we have to talk about how the breast actually feels.

Yeah.

Because it's not like a smooth, uniform implant.

Isn't it lumpy?

It's lumpy.

This is the concept of physiologic nodularity.

The adult breast is almost never perfectly smooth.

It has a texture.

It feels granular, nodular, lumpy.

And that's normal.

It's all a response to hormones.

And it changes throughout the month.

Drastically.

In the premenstrual phase, when estrogen is peaking, the breasts tend to swell, they get tender, and that normal nodularity becomes much more pronounced.

So if you examine a patient right before their period, you're going to feel all kinds of lumps that aren't really masses at all.

They're just hormonally active breast tissue.

This is why Bates is so insistent that the best time for an exam is five to seven days after the period starts.

Things have calmed down.

Things have calmed down.

And at the other end of life, postmenopause, the glandular tissue tends to atrophy.

The lobules decrease in number and the whole thing is replaced by fat.

So the texture changes again, usually becoming softer and less nodular.

This feels like a good transition into the lymphatic system.

The text describes this part as being of great importance, which is usually code for you really need to know this.

It is.

You cannot perform a competent breast exam if you can't visualize this drainage system in your head.

The book says it flat out.

The lymphatic drainage is critical to understanding the spread of carcinoma.

And most of it goes to the armpit.

About 75 percent.

The vast majority of the lymph from the breast drains directly to the axillary nodes in the armpit.

So let's try to build what the book calls the axillary pyramid.

That's a great way to think about it.

Picture the armpit as a pyramid.

The very top point, the apex, is where the axillary vein runs.

The sides are formed by the pectoral muscles in front and the latissimus dorsi muscle in the back.

And all the lymph nodes are inside that pyramid.

They are.

Bates lists about six groups, but it's the flow that really matters.

You have to understand the direction of flow.

OK, so where does the journey start?

I think of it like a hub and spoke system.

The central nodes are the main hub.

They're located deep in the center of the axilla, and they're the ones you're most likely to be able to feel on an exam.

And what feeds into that central hub?

Three main groups of nodes feed into it.

First, you have the anterior or pectoral nodes.

They lie right along the border of the pectoralis minor muscle, and they drain the front of the chest wall and most of the breast itself.

OK, that's group one.

Second, you have the posterior or subscapular nodes.

They're in the back of the armpit, and they drain the back and the posterior chest wall.

And third, you have the lateral nodes, which are up along the upper arm, and they drain, as you'd expect, the arm.

So you got drainage from the breast, the back, and the arm, all dumping into these central nodes.

Exactly, which is why if you feel a big, swollen central node, you have to play detective.

Is this from a cut on their hand, an infection on their back, or is it from a cancer in the breast?

That makes so much sense.

So where does the fluid go after it hits that central hub?

It keeps moving up.

From the central nodes, the lymph flows up to the apical nodes, which are right at the very top of that pyramid, and then to the infraclavicular nodes, which are just under the collarbone.

So it's like an upward ladder.

It's an upward ladder.

And if you find swollen nodes way up high, near the clavicle, that has a much more serious implication.

It means the disease has already climbed the ladder.

It's gotten through all the lower filters.

That really clarifies why we're feeling around in so many different spots in the armpit.

We're not just poking randomly.

We're literally tracing that ladder.

You're mapping the potential spread of disease.

The text also mentions a group called rotter's nodes.

Yeah, those are a smaller group.

They're inner pectoral nodes, located between the pectoralis major and minor muscles.

They're clinically important.

But for a learner, the main flow to visualize is that upward and inward march toward the clavicle.

Got it.

And just to round out the anatomy, let's briefly touch on the male breast.

It's a lot simpler structurally.

Much, much simpler.

In men, it's typically just a small nipple and areola sitting on top of a thin little disk of undeveloped ductal tissue.

Because men don't have the estrogen and progesterone stimulation, they don't develop those lobules.

But we do need to be able to tell the difference between gynecomastia and just, you know, fat.

Absolutely.

And it comes down to what you feel with your fingers.

Gynecomastia is an actual proliferation of that glandular tissue.

It feels like a firm, sometimes tender, rubbery disk that's centered right behind the nipple.

And pseudogynecomastia.

Pseudogynecomastia, which is really common with obesity, is just an accumulation of soft fat.

It doesn't have that firm disk -like quality.

The key distinction is that firmness right behind the nipple.

Okay, fantastic.

We have our map.

We understand the terrain.

Now the patient walks into the room.

We need to take a history.

Bates boils it down to the big three common symptoms.

The big three.

A breast lump or mass, breast pain, which is called nostalgia, and nipple discharge.

Let's start with the lump.

That's the one that brings people in, the one that really scares them.

What are the key questions we need to ask?

It's really just good detective work.

You start with the basics.

Where is it?

How long has it been there?

Has it changed over time?

But the most crucial questions are about the menstrual cycle.

You have to ask, does this lump seem to get bigger or more painful right before your period?

Because if it fluctuates with the cycle, it is much, much more likely to be a benign cyst or a fibrocystic change than it is to be a cancer.

And what about asking about trauma?

That's a good question.

We do ask, but you have to be careful how you interpret the answer.

Very often, a patient will attribute a lump to an injury, when in reality, the injury just made them notice a lump that was already there.

That makes sense.

Okay, symptom number two, pain.

I have a feeling that pain is often the reason for the visit, but maybe not the most concerning sign clinically.

That is a critical insight, and Bates is very, very clear on this point.

Breast pain or nostalgia, when it's the only symptom, is not typically a sign of breast cancer.

That must be a huge relief for patients to hear.

It's the first thing you should tell them.

We categorize pain into two buckets,

cyclic or non -cyclic.

So cyclic just means it tracks with their period.

Yes, exactly.

Cyclic pain is the comet Ipe.

It usually starts right before menses and then gets better once the period begins.

It's often diffuse, meaning it's kind of felt all over the breast, not in one specific spot.

And non -cyclic?

Non -cyclic could be from anything.

It could be trauma, a pulled muscle in the chest wall, inflammation of the ribs, costochondritis.

It tends to be more focal just in one spot.

And we should always check their medication list.

Always.

Bates actually lists out a specific rogues gallery of drugs that are known to cause breast pain.

Hormone therapy is an obvious one, but also some SSRIs and anti -psychotic like haloperidol, and even some blood pressure and heart medications like sperminolactone and digoxin.

You always check the med list before you jump to ordering a bunch of imaging.

Good tip.

Okay, the third big symptom,

discharge.

Nipple discharge can be really alarming for a patient.

How do we sort out the weird but okay physiological discharge from the more worrisome pathologic discharge?

There are some pretty clear rules of thumb.

Physiologic discharge is almost always bilateral.

It's coming from both sides.

It's multi -ductal, meaning if you look closely, it's coming from several little openings on the nipple, and it usually only appears with manipulation.

You have to squeeze to get it out.

Okay, so that's the profile for probably okay.

What's the profile for?

This is concerning.

Pathologic discharge is usually unilateral, just from one breast.

It's often bloody or a clear watery fluid, which we call serous.

And this is key.

It's spontaneous, it comes out on its own, staining their bra or nightgown, and it's much more concerning if it's associated with a lump.

And what if the discharge is milky, but the patient isn't pregnant or breastfeeding?

That's a special category called galactorrhea, and that's usually not a breast problem at all.

It's typically a pituitary gland issue, something called hyperprolactinemia, which can be caused by certain medications or even a small benign tumor on the pituitary.

Fascinating.

Okay, history's done.

We've washed our hands.

It's time for the physical exam.

Section five in BATES covers the general approach and inspection, and they really stress the importance of timing.

It all starts with timing.

Right.

For a premenopausal patient, you should try, if at all possible, to schedule the exam for five to seven days after the start of her period.

Because that's when the hormonal influence is at its lowest point.

Exactly.

The breasts are least swollen, they're least tender, and that physiologic nodularity we talked about is at a minimum.

If you do the exam on day 28 of the cycle, everything is going to feel lumpy, and you'll drive yourself and the patient crazy.

The text also makes a point about rapport.

This is an awkward exam.

There's no getting around it.

For a proper inspection, you need the patient to be uncovered from the waist up, and that leaves them feeling very vulnerable.

So what does BATES recommend?

Inspect both breasts simultaneously at first so you can compare them, but then when you move to palpation, cover up the side you're not examining, and please, please, please warm your hands.

I can't believe that needs to be said.

You would be surprised.

The text specifically says wash with warm water or rub them together.

Cold hands make the patient tense up, their muscles contract, and it completely ruins your ability to feel anything.

Okay, inspection.

We don't just, you know, look, there's a whole routine.

The four views.

Why are we having the patient do these calisthenics?

Because we're actively hunting for asymmetry and for what we call retraction signs, things like dimpling.

Each maneuver is designed to reveal something that might be hidden at rest.

So view one is just arms at sides.

What am I looking for?

You're looking for the obvious things first.

Color, thickening, overall symmetry, but you're specifically looking for a sign called peau d 'orange.

The orange peel skin.

Orange peel skin.

If the skin looks thick and the pores look unusually prominent and pitted, like the peel of an orange, that's a sign of lymphatic obstruction.

It means something.

Usually a cancer is blocking the drainage channels under the skin.

It's a late and very serious sign.

And you're looking at the nipples too.

You're looking at the nipples.

Are they pointing in roughly the same direction?

If one nipple is suddenly inverted when it wasn't before, or if it's deviated pointing off to one side, that suggests a cancer is pulling on the ducts behind it.

Okay, so that's view one.

Then view two is arms overhead and view three is hands pressed against hips.

What did these moves accomplish?

Both of those maneuvers are designed to tighten the skin and the underlying muscles.

When you raise your arms over your head, you're stretching the skin.

If there's a cancer tethered to those cooper ligaments we talked about, the skin won't move up smoothly.

You'll see a little dimple or a flattening appear that wasn't there before.

Bend pressing hands on the hips.

That contracts the pectoralis major muscle.

The muscular backdrop we started with.

The very same.

If you have a deep mass that's fixed to that muscle, making the muscle contract will pull on the mass and the skin over it.

And again, it can reveal a deep dimple or fixation that you would completely miss otherwise.

And the last one, view four, is leaning forward.

This one is especially helpful for women with larger or more pendulous breasts.

You just have them lean forward at the waist and let gravity do the work.

If one breast is being held back or tethered by a tumor while the other one hangs freely, the asymmetry becomes incredibly obvious.

Okay, inspection is done.

Now for palpation.

This is where the technique gets super specific.

Bates is really adamant about using the vertical strip pattern.

They are.

And for good reason.

There are older methods people used to teach, you know, going in concentric circles from the nipple out or doing a wedge pattern.

But the research shows the vertical strip pattern is the best validated technique.

It's the one that's least likely to miss a mass.

So walk me through it.

It's like mowing the lawn.

That is the perfect analogy.

You are methodically mowing the lawn.

You start way out in the axilla at that mid axillary line.

You palpate in a straight line down to the bra line.

Then you move your fingers in just a little bit.

And you go straight back up to the clavicle.

Down, up, down, up.

You cover every single inch of that rectangle we defined.

And we're not just, you know, lightly touching the skin.

Describe the mechanics of the fingers.

You want to use the flat pads of your second, third, and fourth fingers and keep them slightly flexed.

Yeah.

And here is the single biggest thing that students miss.

You have to use three levels of pressure.

At every single spot.

At every single spot on that lawnmower path.

You make small circles with light pressure to feel the tissue just under the skin.

Then you use medium pressure to feel a little deeper.

And then you use deep pressure to feel all the way down to the chest wall, to the ribs.

Wow.

If you're doing that correctly, up and down, covering the whole area, with three distinct pressures at every single point, that must take a long time.

It does.

Bates says a thorough, competent exam should take three minutes per breast.

And I encourage every learner listening to this.

Next time you're in a sim lab or a clinic, set a time for three minutes.

It will feel like an eternity.

But if you rush this, you will miss small masses.

It's as simple as that.

And patient positioning is key here, too.

They have to be lying down, supine.

Always supine.

You need gravity to flatten the breast tissue as thinly as possible against the chest wall.

If the patient is sitting up, the breast tissue bunches up and you can't feel anything distinctly.

And you adjust the position for different parts of the breast.

You do.

For the lateral breast, the outer half, you have the patient roll just slightly onto their opposite hip and place the hand on that side up on their forehead.

That maneuver perfectly spreads all that lateral breast tissue and the talus spens across the rib cage.

And for the inner half, the medial breast.

For the medial part, you have them lie flat again, with their elbow just level with their shoulder.

That keeps the inner tissue thin and allows you to palpate it right up against the sternum.

Okay.

So let's say we're doing the exam correctly and we find something.

We feel a lump.

What's the checklist of things we need to document about it?

You need to create a complete profile of that lump.

So number one, location, quadrant, clock face, distance from the nipple.

Number two.

Size, measure it in centimeters.

Number three, shape.

Is it round?

Is it disc -like?

Is it irregular?

Four, consistency.

Is it soft?

Is it rubbery?

Is it firm?

Or is it rock hard?

Five, delimitation.

Does it have nice, clear, well -circumscribed edges or are the borders fuzzy and indistinct?

Six, tenderness.

And finally, seven, and this is a big one, mobility.

Does it move freely under your fingers or does it feel fixed to the skin or the chest wall?

The text has this incredibly helpful table comparing the three most common types of masses.

Farbritinomas, cysts, and cancer.

This is super high yield for any student.

Let's run through it because it's the mental model you should have in your head during the exam.

Okay, first up, fibrodinoma.

Think young women ages 15 to 25.

The lump feels round or disc -like, maybe a little lobular.

It's usually firm or kind of rubbery.

And the two key features, it is very mobile.

People describe it as a mouse that slips around under your fingers and it's non -tender.

Okay, next, cysts.

Think a slightly older age group, maybe 30 to 50.

Cysts are usually round.

They can feel soft or they can be firm, like a tense water balloon.

And they're often tender, especially before a period.

But like a fibrodinoma, they're mobile.

And finally, cancer.

Think of very wide age range, 30 to 90.

The shape is typically irregular or stellate, which means star -shaped.

The consistency is firm or hard.

The classic description is rock hard.

The borders are not clearly defined.

It may be fixed to the skin or the muscle.

And importantly, it is usually non -tender.

So that's the danger profile,

a painless, hard, fixed, irregular mass.

That's the one that sets off all the alarm bells.

What about palpating the nipple itself?

You just want to gently compress it between your thumb and index finger to check its elasticity.

If it feels thickened or inelastic, that's a potential concern.

And regarding discharge, Bates is very specific.

You should not try to elicit discharge by squeezing the nipple unless the patient has specifically reported it as a symptom.

And if they do report it?

Then you methodically compress the areola at different radial positions, numbers on a clock, trying to figure out which specific duct the discharge is coming from.

That information is invaluable to a surgeon later.

And of course, you note the color, the consistency, and where it came from.

Okay.

We finished the breasts.

Now we move to Section 7, examination of the axillary, the armpit exam.

This always feels so awkward for both the student and the patient.

It is.

It's a ticklish area.

Patients tense up.

The secret to a good axillary exam is support.

You have to get the patient's muscles to relax completely.

How do you do that?

So if you are examining the patient's left axilla, you use your right hand to do the palpating, and you use your left hand to hold and support the patient's left wrist or forearm.

You're carrying the full weight of their arm for them.

Ah, so their muscles don't have to work.

Exactly.

If they are holding their own arm up, their pectoral and latissimus muscles are tight, and they'll bury the lymph nodes, making them impossible to feel.

So their arm is relaxed.

Where do my fingers go?

You cup your fingers, and you reach as high up into the apex of that axillary pyramid as you can possibly go.

You want to get your fingertips behind the pectoral muscles.

Then you press your fingers firmly in toward the chest wall, and you slide them down.

And you're trying to roll the nodes against the ribs?

You're trying to trap the central nodes against the rib cage.

That's your primary target.

And what's a normal finding?

What should it feel like?

It's totally normal to feel one or more small nodes that are less than a centimeter soft and non -tender.

That doesn't mean anything is wrong.

What feels bad is a node that's large over a centimeter hard, matted together with other nodes, or feels fixed to the skin or deep tissues.

And if those central nodes do feel suspicious, then we have to go looking for the others.

That's right.

If the central nodes are enlarged or hard, then you proceed to specifically check the other groups.

The pectoral group, by pinching the anterior fold of the axilla.

The lateral group, by feeling up along the humerus.

And the subscapular group, by feeling inside the posterior fold.

You're trying to map the extent of the spread.

And don't forget the infra -clavicular and supraclavicular nodes above and below the collarbone.

We are in the home stretch now.

Section 8 covers some special cases, the male breast exam, and patients who've had a mastectomy.

For men, the exam is quicker, but no less important.

On inspection, you're looking for any nodules or ulceration of the nipple or areola.

And when you palpate, as we said, you're trying to distinguish that firm, rubbery disc of gynecomastia from the soft, fatty enlargement of obesity.

And the signs of cancer in men are similar.

Very similar.

A hard, irregular, eccentric mass, meaning it's not usually right under the nipple, and it's often painless.

And for patients who have had a mastectomy or reconstruction?

The primary concern there is recurrence of the cancer.

And recurrence has a favorite place to hide.

Scarline.

The scarline.

You must carefully and gently palpate along the entire length of the mastectomy scar, usually using a gentle circular motion.

The text is clear that recurrences often happen right at these incision lines.

And you should also inspect the arm on that side for any signs of lymphedema or swelling, since the surgery often disrupts those lymphatic channels we spent so much time on.

Okay, the exam is finally over.

Now we have to document it.

And no lumps found just isn't going to cut it, is it?

Not at all.

Bates provides some really good examples of clear, concise phrasing.

For a normal finding, something like,

breasts symmetric and smooth without nodules or masses, nipples without discharge,

axillary nodes non -palpable.

And for an abnormal finding?

For an abnormal finding, you have to use that full profile we talked about.

For example, single firm, one by one centimeter mass, mobile and non -tender, located in the upper outer quadrant of the left breast at 11 o 'clock, two centimeters from the nipple.

Overlying peau d 'orange noted.

See how that paints a complete clinical picture for the next person who reads your note.

Absolutely.

Location, size, consistency, mobility, skin changes.

Yeah.

It's all there.

It has to be.

Okay, finally, we get to section 10.

Health promotion and counseling.

This is where we step back and talk to the patient about the big picture, about the future.

Let's start with the epidemiology.

Breast cancer is, unfortunately, the most common cancer in women across the globe.

Here in the US, the lifetime risk is about 12%.

That's where that one in eight women statistic comes from.

But age is really the biggest factor.

Age is the dominant variable by far.

Your risk as a 20 -year -old is about one in 1 ,500.

By the time you're 60, that risk has jumped to one in 29.

It's a disease of aging.

And what are the other major risk factors?

Well, biggest non -modifiable ones are being female and getting older.

After that, it's genetics,

specifically the BRCA1 and BRCA2 gene mutations.

A strong family history, especially having a first -degree relative, like a mother or sister diagnosed at a young age, is also a huge factor.

The text mentions one that I think is less well -known, breast density.

Yes, and this is becoming a bigger and bigger part of the conversation.

Women who have denser breast tissue on a mammogram have a higher risk of developing breast cancer.

It's a double whammy because that dense tissue can also make it harder for the mammogram to find a cancer that's already there.

And the text mentions tools like the Gale Model.

What's that for?

The Gale Model is a risk assessment calculator.

A clinician can plug in a patient's age, race, family history, reproductive history, and it calculates an estimated five -year and lifetime risk of developing breast cancer.

And that helps decide who might need more intensive screening or… Or chemo prevention.

For women at very high risk, we can offer medications like tamoxifen or aromatase inhibitors that can significantly lower their risk of developing breast cancer.

Now we have to get into the controversial part, the screening guidelines.

You've got the USPSTF on one side and the American Cancer Society on the other, and they don't seem to agree.

They don't, and it's because there's a really complex philosophical debate at the heart of screening.

It's about balancing the benefits versus the harms.

The benefit is obvious.

Finding cancer early saves lives.

What are the harms?

The two big harms are false positives and overdiagnosis.

A false positive is when a mammogram shows a shadow that looks like cancer, leading to a lot of anxiety and often an unnecessary biopsy, only to find out it was nothing.

Overdiagnosis is even trickier.

It's finding a real cancer that is so slow -growing, it would never have actually caused the patient any harm in her lifetime.

So different organizations weigh those harms and benefits differently.

Exactly.

The USPSTF, the US Preventive Services Task Force, tends to be more conservative.

Their current recommendation is for mammograms every two years, so biannual screening, for women aged 50 to 74.

That's a grade B recommendation.

For women aged 40 to 49, they say it should be an individualized decision, a grade C.

And what does the American Cancer Society, the ACS, say?

The ACS is a bit more aggressive.

They recommend that women should have the option to start annual screening at age 40, and they strongly recommend annual screening from 45 to 54, then switching to every two years.

So it's confusing your patients.

It's very diffusing.

What about the self -exam?

I feel like for decades, every woman was taught to do a formal breast self -exam in the shower every month.

That has totally changed.

And this is a really important point.

The USPSTF now officially recommends against teaching women to perform a formal ritualized breast self -examination, or BSE.

Why the change?

Because multiple large studies showed that it didn't actually reduce mortality.

It didn't save lives.

But what it did do was cause a huge number of women to find benign lumps, leading to a lot of extra doctor's visits, anxiety, and unnecessary biopsies.

So what's the message now?

Just ignore your breasts.

No, not at all.

The focus has shifted from breast self -exam to breast self -awareness.

The message now is know your own body.

Know what's normal for you.

Pay attention to how your breasts look and feel.

And if you notice a change that persists, report it to your doctor.

But we've moved away from that rigid monthly step -by -step ritual.

That feels like a much more sensible and less anxiety -provoking approach.

I think so.

So looking back on this whole deep dive, we've really gone from the microscopic level of the lobules in Cooper's ligaments, to the very precise mechanics of the vertical strip pattern, and all the way out to these huge national screening policy debates.

It really drives home the point that a physical exam is not just a series of rope motions.

It's an intellectual exercise.

You're using your hands to test hypotheses that you formed based on your knowledge of anatomy and pathology.

You can't just move your hands around.

You have to know what you're feeling for and what it might mean.

And I think the message for the learner listening to this is take your time.

Remember that three minutes per breast.

Use all three levels of pressure.

Don't forget the tale of Spence.

The map is in the book.

You just have to learn how to follow it.

That's it perfectly.

Warm hands, sharp mind.

Well, thank you so much for joining us on this really detailed deep dive into Bates chapter 18.

We sincerely hope this helps demystify the exam and gives you the confidence to go out and perform it thoroughly and correctly.

Keep practicing those skills and we will see you in the next last minute lecture.