Hypertension
Core concepts
Understand primary versus secondary hypertension, with emphasis on renal and endocrine causes relevant to urology: renal artery stenosis, pheochromocytoma, primary aldosteronism, and renin-secreting tumors. Know the renin-angiotensin-aldosterone axis and how each antihypertensive class acts. Recognize the relationship between hypertension and end-organ damage (nephrosclerosis, cardiac hypertrophy, retinopathy).
Traps
Questions often test screening tests: aldosterone-to-renin ratio for primary aldosteronism, plasma metanephrines for pheochromocytoma, and imaging for renal artery stenosis. Watch for the trap of attributing hypertension to a renal mass without confirming hormonal secretion. Another common trap is confusing renovascular hypertension (high renin) with essential hypertension (often normal or low renin). Remember that ACE inhibitors can worsen renal function in bilateral renal artery stenosis.
Rule of thumb
Suspect secondary hypertension when onset is young, blood pressure is resistant, or there is hypokalemia (aldosteronism) or episodic symptoms (pheochromocytoma). Screen with the appropriate biochemical test before imaging.
Worked example
A young patient with resistant hypertension and hypokalemia has an elevated aldosterone-to-renin ratio. This suggests primary aldosteronism; confirm with salt loading and then localize with adrenal imaging and adrenal vein sampling before surgery.
Transplantation
Core concepts
Cover donor selection (living vs deceased, brain death criteria), HLA matching, crossmatching, and immunosuppression principles (induction, maintenance, and treatment of rejection). Understand surgical complications: vascular thrombosis, ureteral stenosis, lymphocele, and urinary leak. Know infection risks by timing after transplant and the spectrum of opportunistic pathogens. Recognize drug toxicities (calcineurin inhibitors causing nephrotoxicity, corticosteroids causing hyperglycemia).
Traps
Questions often test the timing of complications: early (technical/surgical), intermediate (opportunistic infection, acute rejection), late (chronic rejection, malignancy). Distinguish ureteral stenosis (rising creatinine, hydronephrosis) from calcineurin inhibitor toxicity (rising creatinine without obstruction). Another trap: attributing fever to rejection when infection is more likely, or vice versa.
Rule of thumb
Use the post-transplant timeline as a diagnostic framework: days-to-weeks = surgical and early infection; weeks-to-months = opportunistic infection and acute rejection; months-to-years = chronic allograft nephropathy and malignancy.
Worked example
A recipient develops rising creatinine and hydronephrosis three months post-transplant. This points to ureteral stenosis rather than drug toxicity; imaging and possibly stent placement are indicated.
Sexual Dysfunction
Core concepts
Understand erectile physiology (nitric oxide–cGMP pathway, cavernosal smooth muscle relaxation, pudendal and cavernous nerve function), the distinction between psychogenic and organic causes, and the role of vascular, neurologic, hormonal, and medication factors. Know the evaluation (history, focused exam, testosterone, glucose/lipids) and treatment ladder (PDE5 inhibitors, intracavernosal injections, vacuum devices, prosthesis). Also cover ejaculatory disorders and female sexual dysfunction basics.
Traps
Questions often test the interaction of PDE5 inhibitors with nitrates (contraindicated due to severe hypotension). Distinguish psychogenic (sudden, situational, morning erections preserved) from organic (gradual, global, morning erections lost). Another trap: assuming low testosterone alone explains erectile dysfunction without checking other causes. Also remember that radical prostatectomy risks cavernous nerve injury.
Rule of thumb
If morning erections are preserved and onset is situational, favor psychogenic; if loss is gradual and global with vascular risk factors, favor organic. Never combine PDE5 inhibitors with nitrates.
Worked example
A diabetic man reports gradual loss of erections over two years with absent morning erections. This pattern suggests organic, likely vasculogenic, erectile dysfunction; evaluate glycemic control, testosterone, and cardiovascular risk, then start a PDE5 inhibitor if no nitrate use.
Voiding Dysfunction
Core concepts
Distinguish storage symptoms (frequency, urgency, nocturia, incontinence) from voiding symptoms (hesitancy, weak stream, straining, incomplete emptying). Understand bladder outlet obstruction versus detrusor underactivity, and the role of urodynamics. Know causes across age groups: benign prostatic enlargement, urethral stricture, neurogenic bladder, and overactive bladder. Familiarize yourself with post-void residual measurement and pressure-flow studies.
Traps
Questions often conflate symptoms with diagnosis: storage symptoms do not equal obstruction. Another trap is interpreting a high post-void residual as obstruction without pressure-flow confirmation-it can reflect detrusor underactivity. Watch for neurogenic bladder patterns (spastic vs flaccid) and the risk of upper tract deterioration with high bladder pressures.
Rule of thumb
Symptoms describe the phase (storage vs voiding); urodynamics define the mechanism (obstruction vs underactivity). High detrusor pressure with low flow suggests obstruction; low pressure with low flow suggests underactivity.
Worked example
A man with weak stream and elevated post-void residual undergoes pressure-flow study showing high detrusor pressure and low flow. This confirms bladder outlet obstruction rather than detrusor underactivity, supporting relief of obstruction.
Infections
Core concepts
Cover urinary tract infection categories: uncomplicated cystitis, pyelonephritis, complicated UTI, and catheter-associated infection. Know common pathogens (E. coli dominant), risk factors, and appropriate culture use. Understand prostatitis syndromes (acute bacterial, chronic bacterial, chronic pelvic pain), epididymitis, and Fournier gangrene. Familiarize yourself with antimicrobial principles and when imaging is indicated.
Traps
Questions often test when imaging is needed: uncomplicated cystitis does not require imaging, but pyelonephritis with obstruction, recurrent infection, or suspected abscess does. Distinguish sterile pyuria (consider TB, chlamydia) from culture-positive infection. Another trap: treating asymptomatic bacteriuria in most patients is unnecessary except in pregnancy or before urologic procedures.
Rule of thumb
Treat symptoms, not cultures alone: asymptomatic bacteriuria generally needs no treatment except in pregnancy or pre-procedure. Suspect obstruction when pyelonephritis fails to improve within 48–72 hours.
Worked example
A patient with pyelonephritis remains febrile after 72 hours of appropriate antibiotics. Imaging is indicated to exclude obstruction or abscess, which would require drainage rather than continued antibiotics alone.
Inflammatory Diseases
Core concepts
Understand non-infectious inflammatory conditions affecting the urinary tract: interstitial cystitis/bladder pain syndrome, granulomatous diseases, and autoimmune renal involvement. Know the presentation of bladder pain syndrome (chronic pelvic pain, urgency, negative cultures) and its diagnosis of exclusion. Familiarize yourself with systemic conditions with urologic manifestations, such as sarcoidosis, lupus, and vasculitis.
Traps
Questions often test the diagnosis of exclusion: interstitial cystitis requires excluding infection, malignancy, and other causes before diagnosis. Another trap is misattributing symptoms to infection when cultures are repeatedly negative. Watch for the overlap between chronic prostatitis/chronic pelvic pain syndrome and bladder pain syndrome.
Rule of thumb
When cultures are repeatedly negative but symptoms persist, shift from an infectious to an inflammatory paradigm and pursue exclusion of malignancy and other specific causes.
Worked example
A woman with chronic pelvic pain, urgency, and negative cultures undergoes cystoscopy showing Hunner lesions. This supports interstitial cystitis after exclusion of other causes.
Endocrinopathy
Core concepts
Focus on endocrine conditions relevant to urology: hypogonadism (primary vs secondary), thyroid disease effects on voiding, adrenal disorders (aldosteronism, pheochromocytoma, Cushing), and parathyroid/calcium disorders linked to stone disease. Understand the hypothalamic-pituitary-gonadal axis and testosterone evaluation. Recognize how endocrine disease affects fertility and sexual function.
Traps
Questions often test the distinction between primary (high LH/FSH) and secondary (low LH/FSH) hypogonadism. Another trap: diagnosing hypogonadism on a single low testosterone without confirmatory morning testing. Watch for hyperparathyroidism as a cause of recurrent calcium stones and the need to check calcium and PTH.
Rule of thumb
Low testosterone with high gonadotropins = primary testicular failure; low testosterone with low or inappropriately normal gonadotropins = secondary (central) failure. Confirm low testosterone with repeat morning levels.
Worked example
A man with low libido has a low morning testosterone and elevated LH and FSH. This indicates primary hypogonadism (testicular failure), not central suppression.
Calculus Disease
Core concepts
Understand stone composition (calcium oxalate, calcium phosphate, uric acid, struvite, cystine), risk factors, and metabolic evaluation. Know presentation (renal colic, hematuria) and imaging (noncontrast CT preferred). Familiarize yourself with acute management (analgesia, hydration, medical expulsive therapy) and indications for intervention (obstruction with infection, refractory pain, large stones). Cover prevention by stone type.
Traps
Questions often test the urgency of infected obstructed systems-this is an emergency requiring decompression. Distinguish struvite (infection-related, urease-producing organisms) from other stones. Another trap: assuming all stones need intervention; many small distal stones pass spontaneously. Watch for cystine stones in young patients with recurrent stones.
Rule of thumb
Infected obstruction = emergent decompression. Stone size predicts passage: smaller distal stones are more likely to pass spontaneously.
Worked example
A patient with fever, flank pain, and a obstructing stone has an infected obstructed system. Emergent decompression (stent or nephrostomy) plus antibiotics is required; definitive stone treatment follows after stabilization.
Trauma
Core concepts
Cover renal, ureteral, bladder, and urethral trauma, plus genital trauma. Understand injury grading, the role of CT with contrast (including delayed phases for urinary collecting system), and indications for operative versus nonoperative management. Recognize the classic signs: gross hematuria after blunt trauma, blood at the urethral meatus, and pelvic fracture with bladder injury.
Traps
Questions often test when to obtain imaging: gross hematuria after blunt trauma generally warrants imaging, while microscopic hematuria alone may not. Another trap: attempting urethral catheterization when urethral injury is suspected (blood at meatus, high-riding prostate)-obtain a retrograde urethrogram first. Watch for the difference between intraperitoneal and extraperitoneal bladder rupture and their management.
Rule of thumb
Suspected urethral injury = no catheter until retrograde urethrogram. Gross hematuria after significant trauma = image the urinary tract.
Worked example
A patient with pelvic fracture has blood at the urethral meatus. Do not place a Foley; perform retrograde urethrogram to evaluate for urethral injury before any catheterization.
Obstructive Uropathy
Core concepts
Understand the causes and consequences of urinary obstruction: hydronephrosis, rising creatinine, and risk of infection. Distinguish acute from chronic obstruction and unilateral from bilateral. Know the evaluation (ultrasound first, CT for stone or mass) and management (decompression by stent or nephrostomy). Recognize reversible versus irreversible renal damage.
Traps
Questions often test that hydronephrosis does not always mean obstruction (can occur with dilation without obstruction) and that obstruction can occur without hydronephrosis (early or volume-depleted states). Another trap: missing bilateral obstruction as a cause of acute kidney injury. Watch for the urgency of infected obstruction.
Rule of thumb
Obstruction plus infection or renal failure = decompress promptly. Ultrasound is the initial test; CT defines the cause when needed.
Worked example
A patient with acute kidney injury and bilateral hydronephrosis requires urgent decompression; unilateral obstruction rarely causes significant creatinine rise in a patient with a normal contralateral kidney.
Fertility
Core concepts
Understand male factor infertility evaluation: semen analysis (concentration, motility, morphology), hormonal assessment (testosterone, FSH, LH, prolactin), and genetic testing when indicated. Know causes: varicocele, obstruction, hypogonadism, and ejaculatory dysfunction. Familiarize yourself with female factor basics and assisted reproduction principles. Recognize the impact of urologic surgery and medications on fertility.
Traps
Questions often test the interpretation of semen analysis and when to pursue further testing. Another trap: assuming a varicocele always requires repair-only when clinically significant. Watch for the distinction between obstructive and nonobstructive azoospermia (FSH and testicular volume help).
Rule of thumb
Azoospermia with low FSH and normal testicular volume suggests obstruction; high FSH with small testes suggests nonobstructive failure.
Worked example
A man with azoospermia has normal testicular volume and low FSH. This pattern suggests obstructive azoospermia; evaluation for obstruction and possible reconstruction or sperm retrieval is appropriate.
Neoplasms
Core concepts
Cover the major urologic malignancies: renal cell carcinoma, urothelial carcinoma (bladder and upper tract), prostate cancer, and testicular germ cell tumors. Understand risk factors, presenting signs (hematuria, flank mass, testicular mass), staging principles, and treatment overview. Familiarize yourself with tumor markers (PSA, AFP, beta-hCG, LDH) and the role of imaging.
Traps
Questions often test the difference between painless gross hematuria (malignancy workup needed) and painful hematuria (often infectious/stone). Another trap: assuming a testicular mass is benign-any solid mass is malignant until proven otherwise. Watch for the difference between seminoma and nonseminomatous germ cell tumors and their markers.
Rule of thumb
Painless gross hematuria in an adult warrants evaluation for urothelial malignancy. Any solid testicular mass is cancer until proven otherwise.
Worked example
A young man with a painless testicular mass has elevated AFP and beta-hCG. This suggests a nonseminomatous germ cell tumor; orchectomy and staging follow.
Urinary Diversion
Core concepts
Understand types of urinary diversion: ileal conduit (noncontinent), continent cutaneous reservoirs, and orthotopic neobladder. Know indications, metabolic consequences (hyperchloremic metabolic acidosis with bowel segments), and complications (stones, stricture, vitamin B12 deficiency with ileal resection). Familiarize yourself with stoma care and surveillance.
Traps
Questions often test the metabolic consequence of ileal versus colonic segments-ileal conduits can cause hyperchloremic metabolic acidosis. Another trap: assuming all diversions require the same follow-up; neobladders require voiding rehabilitation and surveillance. Watch for vitamin B12 deficiency after ileal resection.
Rule of thumb
Bowel diversion can cause hyperchloremic metabolic acidosis; monitor electrolytes. Ileal resection risks vitamin B12 deficiency.
Worked example
A patient with an ileal conduit develops fatigue and a normal anion gap metabolic acidosis. This fits hyperchloremic acidosis from urine reabsorption by the bowel segment; evaluate and manage accordingly.
Fistulae
Core concepts
Understand genitourinary fistulae: vesicovaginal, urethrovaginal, rectourethral, and enterovesical. Know causes (surgery, radiation, malignancy, trauma, childbirth) and presentation (continuous urinary leakage, pneumaturia, fecaluria). Familiarize yourself with diagnostic evaluation (dye tests, cystoscopy, imaging) and management principles.
Traps
Questions often test the distinction between vesicovaginal fistula (continuous leakage after pelvic surgery) and stress incontinence (leakage with activity). Another trap: missing enterovesical fistula when pneumaturia and fecaluria are present. Watch for the timing of repair after radiation or surgery.
Rule of thumb
Continuous leakage after pelvic surgery suggests a fistula, not stress incontinence. Pneumaturia plus fecaluria suggests enterovesical fistula.
Worked example
A woman with continuous urinary leakage after hysterectomy is evaluated with a dye test confirming a vesicovaginal fistula; management depends on timing and tissue quality.
Pediatric Urology
Core concepts
Cover congenital anomalies: hypospadias, cryptorchidism, vesicoureteral reflux, ureteropelvic junction obstruction, and posterior urethral valves. Understand antenatal hydronephrosis evaluation and the timing of surgical intervention. Familiarize yourself with testicular descent and the risk of malignancy with undescended testes.
Traps
Questions often test the timing of orchidopexy (generally within the first year) and the contraindication to circumcision in hypospadias (the foreskin may be needed for repair). Another trap: attributing antenatal hydronephrosis to obstruction without appropriate postnatal imaging. Watch for posterior urethral valves presenting with a thick-walled bladder and bilateral hydronephrosis in a male infant.
Rule of thumb
Do not circumcise a child with hypospadias before repair. Undescended testes warrant orchidopexy to reduce malignancy and infertility risk.
Worked example
A newborn male has a ventral urethral meatus and chordee. This is hypospadias; circumcision should be deferred because the foreskin may be used in reconstruction.
Anatomy
Core concepts
Master surgical anatomy of the kidney (vessels, collecting system), ureter (course and narrow points), bladder, prostate (zones, neurovascular bundles), and external genitalia. Understand fascial planes and the blood supply relevant to surgery. Familiarize yourself with the lymphatic drainage of urologic organs.
Traps
Questions often test the ureter's narrow points where stones lodge (ureteropelvic junction, crossing the iliac vessels, ureterovesical junction). Another trap: confusing prostate zones (peripheral zone most cancers; transition zone BPH). Watch for the location of the neurovascular bundles during radical prostatectomy.
Rule of thumb
Stones lodge at the three ureteral narrow points: UPJ, iliac vessel crossing, and UVJ. Peripheral zone = cancer; transition zone = BPH.
Worked example
A stone is seen at the ureterovesical junction. This is one of the three narrow points where stones commonly lodge, consistent with distal ureteral colic.
Fluid and Electrolyte Disorders
Core concepts
Understand volume status assessment, sodium and water balance, potassium disturbances, and acid-base disorders. Know the causes and management of hyponatremia, hyperkalemia, and metabolic acidosis in urologic patients (e.g., post-obstruction diuresis, bowel diversion). Familiarize yourself with intravenous fluid selection and the consequences of large-volume resuscitation.
Traps
Questions often test the difference between hyponatremia due to water excess versus sodium loss, and the risk of rapid correction (osmotic demyelination). Another trap: missing hyperkalemia in obstructive uropathy or after bowel diversion. Watch for post-obstructive diuresis causing volume depletion and electrolyte losses.
Rule of thumb
Correct hyponatremia slowly to avoid osmotic demyelination. After relief of obstruction, monitor for post-obstructive diuresis and replace losses.
Worked example
A patient develops large-volume diuresis after relief of bilateral obstruction, with falling blood pressure and electrolyte losses. This is post-obstructive diuresis; monitor and replace fluids and electrolytes carefully.