Chapter 51: Penile and Testicular Disorders

Erectile dysfunction, the inability to achieve or sustain erection adequate for sexual function, represents a prevalent condition affecting more than one-third of males by age fifty-five, with most cases attributable to identifiable physiological factors including cardiovascular disease rather than purely psychological causes. The pathophysiology involves failures at three distinct levels: nerve impulse initiation resulting from neurological or endocrine dysfunction, penile arterial filling due to vascular insufficiency, or blood retention through veno-occlusive mechanisms. Pharmacological agents including beta-blockers, selective serotonin reuptake inhibitors, and spironolactone frequently contribute to erectile dysfunction, while diagnostic approaches ranging from biochemical assays of glucose and lipid metabolism to specialized testing of nocturnal penile tumescence help distinguish organic from psychogenic etiologies. Treatment modalities span phosphodiesterase-5 inhibitors such as sildenafil, hormonal supplementation, mechanical devices, and surgical prosthetic implantation. The chapter addresses acute inflammatory and structural scrotal pathologies, including epididymitis presenting with pain and swelling that varies by patient age and causative organism, with sexually transmitted pathogens predominating in younger males and enteric bacteria in older populations. Testicular torsion, a true urological emergency involving spermatic cord twisting and acute ischemia, requires urgent surgical intervention within four to six hours to prevent irreversible tissue necrosis, distinguished from epididymitis by the absent cremasteric reflex and lack of pain relief with scrotal elevation. Benign scrotal abnormalities including hydroceles, fluid collections identifiable by transillumination, and varicoceles, described as a bag-of-worms sensation from pampiniform plexus venous dilation, warrant clinical evaluation particularly given the association between varicoceles and male factor infertility. Testicular malignancy, the most common solid tumor in young males aged fifteen to thirty-five, demonstrates remarkable curability despite its prevalence, with cryptorchidism as the established risk factor and painless testicular nodules as the typical presentation, managed primarily through radical orchiectomy with adjunctive radiation or combination chemotherapy depending on histological classification and disease stage, with consideration for sperm cryopreservation given treatment-related reproductive implications.