Urology, Scrotal Emergencies, Urologic Oncology & Voiding Dysfunction

When clinical suspicion for Testicular Torsion is high (classic presentation), proceed immediately to the operating room for surgical exploration, detorsion, and BILATERAL orchiopexy (because the bell-clapper deformity is bilateral in >80% of patients; if the torsed testis is black/nonviable, perform unilateral orchiectomy plus contralateral orchiopexy)—do NOT delay surgery for a color Doppler ultrasound! If the clinical presentation is equivocal, color Doppler scrotal ultrasound demonstrates absent or markedly decreased intratesticular blood flow (and the spermatic cord “whirlpool sign”). By contrast, Torsion of the Appendix Testis (a vestigial Mullerian/paramesonephric duct remnant at the superior pole of the testis) typically occurs in boys aged 7–14 years with gradual localized upper-pole tenderness, an intact cremasteric reflex, normal Doppler testicular perfusion, and a pathognomonic “blue dot sign” visible through the superior scrotal skin; management is purely supportive (rest, ice, scrotal elevation, and oral NSAIDs). Acute Epididymitis / Epididymo-orchitis presents with gradual posterior scrotal pain, dysuria/urethral discharge, fever, an intact cremasteric reflex, a positive Prehn sign (pain relief with scrotal elevation), and increased blood flow (hyperemia) on Doppler ultrasound: in sexually active men <35 years old, the etiology is Chlamydia trachomatis and Neisseria gonorrhoeae (treat with ceftriaxone IM x 1 PLUS doxycycline x 10 days), whereas in men >35 years old (or boys with urinary tract anomalies/BPH), the etiology is enteric Escherichia coli refluxing into the vas deferens (treat with levofloxacin or TMP-SMX x 10 days).

Painless benign scrotal masses are differentiated by palpation and transillumination: (1) A Hydrocele is an accumulation of serous fluid within a persistent processus vaginalis (communicating hydrocele, which fluctuates in size) or non-communicating tunica vaginalis sac anterior to the testis; it transilluminates brightly (in infants, observe for spontaneous closure until age 12 months unless an inguinal hernia is present). (2) A Spermatocele (epididymal cyst) is a painless, cystic, sperm-containing mass located distinctly at the superior head of the epididymis posterior to the testis that also transilluminates. (3) A Varicocele is a tortuous dilation of the pampiniform venous plexus (the #1 surgically correctable cause of male infertility due to scrotal hyperthermia impairing spermatogenesis) that does NOT transilluminate, feels like a “bag of worms” superior to the testis, enlarges with standing/Valsalva, and decompresses (empties) when the patient lies supine. Over 90% of idiopathic varicoceles occur on the LEFT side because the left gonadal (testicular) vein drains vertically at a 90-degree angle into the high-pressure left renal vein (which can also be compressed between the superior mesenteric artery and aorta in Nutcracker syndrome), whereas the right gonadal vein drains obliquely directly into the low-pressure IVC. Crucially, a new-onset varicocele in an older man, a RIGHT-sided varicocele, or a varicocele that FAILS to empty when supine raises immediate suspicion for a retroperitoneal mass—specifically Renal Cell Carcinoma invading the renal vein or IVC—and mandates an urgent CT scan of the abdomen and pelvis! Cryptorchidism (undescended testis) affects 3% of full-term male neonates (most descend spontaneously by 3–4 months as testosterone surges); if the testis remains undescended at 6 months of age, perform surgical orchiopexy between 6 and 18 months of age to preserve fertility (Sertoli/germ cell survival), facilitate testicular self-examination, and reduce (though not eliminate!) the elevated risk of testicular germ cell tumors (especially seminoma).

Testicular Germ Cell Tumors (GCTs) are divided into Seminomas and Non-Seminomatous Germ Cell Tumors (NSGCTs): (1) Seminoma (55%; peak age 30–40 years; ovarian homolog = dysgerminoma) forms a homogeneous, lobulated, pale mass without hemorrhage or necrosis; histology shows sheets of large uniform clear cells with prominent nucleoli and lymphocytic fibrous septa; serum PLAP and LDH are elevated, beta-hCG is mildly elevated in 10–15% (due to syncytiotrophoblasts), and AFP is NEVER elevated (if AFP is elevated in a biopsy called “seminoma,” the tumor is actually a mixed NSGCT and must be treated as a non-seminoma!). Seminomas spread slowly via lymphatics and are exquisitely sensitive to radiation and platinum chemotherapy. (2) Yolk Sac (Endodermal Sinus) Tumor is the most common testicular tumor in infants and boys <3 years old; it secretes Alpha-Fetoprotein (AFP; 100%) and exhibits pathognomonic glomerular-like Schiller-Duval bodies on histology. (3) Choriocarcinoma is a rare, highly malignant trophoblastic tumor composed of cytotrophoblasts and syncytiotrophoblasts that spreads early via the hematogenous route to the lungs (cannonball metastases) and brain (hemorrhagic stroke); it secretes massive quantities of beta-hCG, causing gynecomastia and hyperthyroidism (because the alpha-subunit of beta-hCG is identical to TSH, LH, and FSH!). (4) Embryonal Carcinoma forms a painful, hemorrhagic/necrotic mass that elevates both beta-hCG and AFP (may transform into other GCTs after chemotherapy). (5) Teratoma contains mature or immature tissues from all three germ layers (ectoderm, mesoderm, endoderm; normal AFP/hCG); crucially, while ovarian mature cystic teratomas (dermoid cysts) in women are benign, all postpubertal testicular teratomas in men are malignant and chemo-resistant, requiring surgical resection.

Non-germ cell Sex Cord-Stromal Tumors are usually benign (90%) and negative for AFP and beta-hCG: (1) Leydig Cell Tumor secretes androgens (testosterone) and estrogens, presenting in boys with gonadotropin-independent precocious puberty or in adult men with gynecomastia; histology shows golden-brown tumor cells containing pathognomonic intracytoplasmic rod-shaped Reinke crystals. (2) Sertoli Cell Tumor consists of tubules lined by Sertoli cells and is generally hormonally silent (associated with Peutz-Jeghers syndrome). Finally, in men over age 60, the #1 most common testicular neoplasm is Diffuse Large B-Cell Non-Hodgkin Lymphoma (often presenting as bilateral testicular enlargement).

Renal Cell Carcinoma (RCC) affects men aged 50–70 years (risk factors: smoking, obesity, hypertension, acquired cystic disease of dialysis, and Von Hippel-Lindau disease) and presents with the classic triad of flank pain, palpable flank mass, and gross hematuria (though all three occur together in only 10%), alongside fever, weight loss, a left-sided non-reducing varicocele (from tumor thrombus invading the left renal vein), and four paraneoplastic syndromes: Polycythemia (ectopic EPO), Hypercalcemia (PTHrP), Hypertension (renin), and Cushing syndrome (ACTH) (plus non-metastatic hepatic dysfunction known as Stauffer syndrome). Clear cell RCC (75%) results from deletion of the VHL tumor suppressor gene on chromosome 3p (upregulating HIF-1a and VEGF), forming a golden-yellow polar mass of lipid/glycogen-filled clear cells; treatment of localized RCC is partial or radical nephrectomy (metastatic RCC is treated with VEGF tyrosine kinase inhibitors [sunitinib, pazopanib] and immune checkpoint inhibitors [nivolumab + ipilimumab]). In children aged 2–4 years, the #1 renal malignancy is Wilms Tumor (Nephroblastoma), derived from metanephric blastema (WT1/WT2 mutations on chromosome 11p) and presenting as a smooth, unilateral flank mass that does NOT cross the midline (distinguishing it from adrenal Neuroblastoma, which is irregular, calcified, elevates urinary HVA/VMA, and crosses the midline); check for associated syndromes: WAGR (Wilms tumor, Aniridia, Genitourinary malformations, Retardation/intellectual disability—WT1 deletion), Denys-Drash (Wilms + male pseudohermaphroditism + diffuse mesangial sclerosis), and Beckwith-Wiedemann (Wilms + hepatoblastoma + macroglossia + omphalocele + hemihypertrophy + neonatal hypoglycemia—WT2 imprinting). In the urinary bladder, Urothelial (Transitional Cell) Carcinoma presents with painless gross hematuria throughout micturition in older smokers or workers exposed to naphthylamine/azo aniline dyes (rubber, textile, leather, print industries), phenacetin, or cyclophosphamide (prevented by mesna); diagnosis is by cystoscopy with transurethral resection of bladder tumor (TURBT): non-muscle-invasive tumors (Ta, T1, CIS) are treated with TURBT plus intravesical Bacillus Calmette-Guérin (BCG) immunotherapy (which induces a local Th1/macrophage granulomatous response), whereas muscle-invasive tumors (≥T2 into detrusor muscle) require radical cystectomy with ileal conduit urinary diversion.

Benign Prostatic Hyperplasia (BPH) is driven by prostatic stromal and glandular 5-alpha-reductase conversion of testosterone into potent dihydrotestosterone (DHT) in the periurethral transitional zone, causing storage symptoms (frequency, urgency, nocturia) and voiding symptoms (hesitancy, weak stream, incomplete emptying, post-void residual >100–200 mL). First-line rapid symptom relief is an alpha-1A selective adrenergic antagonist (tamsulosin, alfuzosin, silodosin—relaxes prostatic smooth muscle within days; side effects include retrograde ejaculation and intraoperative floppy iris syndrome; non-selective doxazosin/terazosin also treat hypertension), or a PDE-5 inhibitor (daily tadalafil) if erectile dysfunction coexists. For prostates >30–40 g, add a 5-alpha-reductase inhibitor (finasteride, dutasteride), which takes 3–6 months to shrink prostate volume by 25%, reduces acute urinary retention risk, and artificially lowers serum PSA by 50% (so double the measured PSA when screening a patient on finasteride!). Refractory BPH (recurrent urinary retention, recurrent UTIs, bladder stones, or bilateral hydronephrosis/post-renal AKI) is treated surgically via Transurethral Resection of the Prostate (TURP). By contrast, Prostate Adenocarcinoma arises in the posterior peripheral zone, is graded histologically by the Gleason score (sum of the two most prevalent architectural patterns, 6 to 10; small crowded glands lacking an outer p63+ basal cell layer with prominent nucleoli), and spreads hematogenously via Batson's paravertebral venous plexus to the lumbar spine—producing osteoblastic (sclerotic) bone metastases with elevated serum PSA and alkaline phosphatase. Localized low-risk prostate cancer is managed with active surveillance, radical prostatectomy, or radiation, whereas metastatic disease requires Androgen Deprivation Therapy (chemical castration) using a continuous GnRH agonist (leuprolide, goserelin—preceded by the androgen-receptor antagonist flutamide or bicalutamide to prevent an initial LH/testosterone surge and spinal cord compression flare) or a GnRH antagonist (degarelix, relugolix—no flare!), plus abiraterone or enzalutamide.

(1) Stress Urinary Incontinence results from urethral hypermobility (loss of pelvic floor levator ani support due to multiparity, vaginal delivery, obesity, or menopause) or intrinsic sphincter deficiency (post-prostatectomy in men); patients leak small volumes of urine instantaneously during increases in intra-abdominal pressure (coughing, sneezing, laughing, jumping, or Valsalva) with a normal PVR (<50 mL), a positive bladder stress test (visible urethral leakage on cough), and urethral hypermobility (>30 degrees on Q-tip test). First-line treatment is pelvic floor muscle strengthening (Kegel exercises), weight loss, and vaginal pessaries; definitive surgical treatment is a midurethral synthetic mesh sling. (2) Urge Urinary Incontinence (Overactive Bladder / Detrusor Overactivity) results from uninhibited, spontaneous contractions of the detrusor muscle during bladder filling; patients experience a sudden, overwhelming urge to void (often triggered by hearing running water or unlocking the front door) followed by involuntary leakage, urinary frequency, and nocturia, with a normal PVR (<50 mL). First-line treatment is bladder training (timed voiding) and avoidance of caffeine/alcohol; second-line pharmacotherapy is a beta-3 adrenergic agonist (mirabegron or vibegron—preferred in older adults because it avoids anticholinergic delirium/dementia!) or an M3 antimuscarinic agent (oxybutynin, tolterodine, solifenacin, darifenacin). (3) Overflow Incontinence results from either detrusor underactivity (neurogenic atonic bladder due to diabetic autonomic neuropathy, multiple sclerosis, or sacral S2–S4 cauda equina injury) OR bladder outlet obstruction (severe BPH, urethral stricture, or pelvic organ prolapse). Because the bladder cannot empty, intravesical hydrostatic pressure eventually exceeds urethral resistance, causing continuous/frequent small-volume dribbling, weak stream, and a markedly elevated Post-Void Residual (PVR >200 mL); treatment requires relieving the outlet obstruction (alpha-1 blocker tamsulosin or TURP for BPH) or enhancing emptying via clean intermittent catheterization and the muscarinic agonist bethanechol.

Continuous, painless, day-and-night vaginal leakage of urine (unrelated to coughing or urgency) indicates an extra-urethral urogenital fistula: in resource-rich settings, the #1 cause is iatrogenic bladder or ureteral injury during pelvic surgery (total abdominal/vaginal hysterectomy) or pelvic radiation, whereas in resource-limited settings, the #1 cause is prolonged obstructed labor (pressure necrosis of the anterior vaginal wall and bladder trigone against the fetal head). Diagnosis is confirmed by speculum examination and the intravesical methylene blue / oral phenazopyridine tampon test (or CT cystography/urography), and treatment is surgical fistula repair with an interposition flap.

Posterior urethral injuries (prostatic and membranous urethra) result from high-energy pelvic ring fractures shearing the puboprostatic ligaments (presenting with blood at the meatus, pelvic fracture, and high-riding prostate), whereas Anterior urethral injuries (bulbar and penile urethra) result from straddle falls onto a bicycle crossbar or fence (crushing the bulbar urethra against the pubic symphysis and presenting with a perineal “butterfly” hematoma if Buck's fascia is disrupted). Both are diagnosed by Retrograde Urethrography (RUG) and managed acutely with suprapubic catheterization. Urinary Bladder Rupture presents with gross hematuria and suprapubic pain after blunt lower abdominal trauma or pelvic fracture and is diagnosed by Retrograde Cystography (plain film or CT cystogram—passive clamping of a Foley during routine IV contrast CT is insufficient; contrast must be instilled retrogradely into the bladder!): (1) Extraperitoneal bladder rupture (85%; caused by bone spicules of an anterior pelvic fracture puncturing the bladder neck/base) shows “flame-shaped” contrast extravasation confined to the pelvic retroperitoneum and is managed conservatively with indwelling Foley catheter drainage alone for 10–14 days; (2) Intraperitoneal bladder rupture (15%; caused by a direct blow to a distended bladder dome—the weakest, peritonealized portion—such as a seatbelt injury in an intoxicated driver) shows contrast outlining intraperitoneal bowel loops and paracolic gutters (with resorptive elevation of serum BUN/creatinine and hyponatremia) and mandates immediate surgical laparotomy/laparoscopy with two-layer bladder dome repair.

In nephrolithiasis / ureterolithiasis (diagnosed via non-contrast helical CT of the abdomen/pelvis, or renal ultrasound in pregnant women), uncomplicated ureteral stones ≤5 mm pass spontaneously with hydration and NSAID analgesia, stones 5–10 mm receive medical expulsive therapy with tamsulosin (alpha-1 blocker), and stones >10 mm require shockwave lithotripsy or ureteroscopy. However, if an obstructing ureteral stone is accompanied by fever, leukocytosis, pyuria, or septic shock (obstructive pyelonephritis), lithotripsy and definitive stone extraction are contraindicated—the patient requires EMERGENCY renal decompression via percutaneous nephrostomy tube OR retrograde ureteral double-J stent placement PLUS broad-spectrum IV antibiotics! Priapism is a persistent erection lasting >4 hours unrelated to sexual stimulation: Low-flow (ischemic, veno-occlusive) priapism (95%; caused by sickle cell disease, trazodone, intracavernosal alprostadil/papaverine, or PDE-5 inhibitors) presents as a painful, rigid corpora cavernosa (sparing the soft glans penis and corpus spongiosum) with cavernosal blood gas showing dark, hypoxic, hypercapnic, acidotic blood (pH <7.25, pO2 <30 mmHg, pCO2 >60 mmHg)—representing a compartment syndrome of the penis treated urgently with corporal blood aspiration/saline irrigation and intracavernosal injection of the alpha-1 agonist phenylephrine (contrasted with painless post-traumatic high-flow non-ischemic arterial priapism from a pudendal arteriovenous fistula, which has bright red oxygenated blood and is observed or embolized). Fournier Gangrene is a fulminant polymicrobial (E. coli, Bacteroides, Streptococcus, Staphylococcus, Clostridium) necrotizing fasciitis of the perineum, scrotum, and genital fascia (strongly associated with diabetes mellitus, SGLT2 inhibitors [empagliflozin/canagliflozin], perirectal abscess, and alcoholism), presenting with excruciating perineal pain out of proportion to skin findings, rapidly spreading erythema/bullae, subcutaneous crepitus, dishwater foul-smelling discharge, and septic shock; treatment is IMMEDIATE aggressive surgical debridement in the operating room plus broad-spectrum IV antibiotics (vancomycin + piperacillin-tazobactam or meropenem + clindamycin to inhibit bacterial toxin synthesis).

Vesicoureteral Reflux (VUR)—retrograde flow of urine from the bladder into the upper urinary tract due to an abnormally short intramural ureteral tunnel at the ureterovesical junction—predisposes infants and young children to recurrent febrile urinary tract infections (pyelonephritis) and reflux nephropathy (renal cortical scarring, hypertension, and chronic kidney disease). After a first febrile UTI in an infant aged 2–24 months, obtain a Renal and Bladder Ultrasound (RBUS) to detect hydronephrosis; perform a Voiding Cystourethrogram (VCUG) (which grades VUR from Grade I to Grade V) if the ultrasound shows hydronephrosis/scarring or after a second febrile UTI, and assess permanent renal cortical scarring via a Tc-99m DMSA renal cortical scan. Mild-to-moderate VUR (Grades I–III) resolves spontaneously with child growth, whereas high-grade VUR (Grades IV–V) with recurrent febrile UTIs is managed with continuous antibiotic prophylaxis (TMP-SMX or nitrofurantoin; amoxicillin in infants <2 months) or surgical ureteral reimplantation. By contrast, Ureteropelvic Junction (UPJ) Obstruction is the most common cause of unilateral fetal/neonatal hydronephrosis WITHOUT ureteral dilation (evaluated via Tc-99m MAG3 diuretic renogram). Cryptorchidism (Undescended Testis) affects 3% of full-term and 30% of premature male infants: because spontaneous testicular descent rarely occurs after 6 months of age, and persistent intra-abdominal/inguinal temperature damages Sertoli/germ cells (causing infertility) and increases the risk of testicular germ cell cancer (particularly seminoma) and testicular torsion, perform surgical Orchiopexy between 6 and 18 months of age (note: orchiopexy does not eliminate testicular cancer risk, but places the testis in the scrotum to allow early physical self-examination!).

Penile erection requires intact parasympathetic pelvic splanchnic innervation (S2–S4; “Point”), which releases Nitric Oxide (NO) from cavernosal nerves and endothelial cells to stimulate guanylyl cyclase, converting GTP to cGMP to relax corpus cavernosum smooth muscle and allow arterial blood inflow (whereas ejaculation is mediated by sympathetic hypogastric nerves [T11–L2; “Shoot”] and somatic pudendal nerves). The single most important clinical feature distinguishing Psychogenic Erectile Dysfunction from Organic (Vascular, Neurogenic, Endocrine, or Medication-Induced) Erectile Dysfunction is the presence of normal nocturnal and early-morning erections (confirmed by the Nocturnal Penile Tumescence [NPT] stamp/RigiScan test): patients with sudden-onset situational ED who retain normal morning erections have psychogenic ED (treated with reassurance and sex therapy/CBT), whereas gradual loss of both coital and morning erections indicates organic ED (most commonly atherosclerotic endothelial dysfunction from diabetes, hypertension, smoking, or radical prostatectomy, or medication-induced from SSRIs, thiazide diuretics, spironolactone, or beta-blockers). First-line pharmacotherapy for both psychogenic and organic ED is an oral Phosphodiesterase-5 (PDE-5) inhibitor (Sildenafil, Tadalafil, Vardenafil), which inhibits cGMP breakdown (strictly contraindicated within 24–48 hours of nitrates and used with caution alongside alpha-blockers due to life-threatening hypotension); second-line options include intracavernosal alprostadil (PGE1) injections, vacuum constriction devices, and inflatable penile prostheses. Peyronie Disease is acquired localized fibrous plaque formation within the tunica albuginea of the penis, causing painful dorsal/lateral penile curvature during erection (associated with Dupuytren contracture and treated with intralesional collagenase or surgical plication).