Detail exaplation for each case in urology
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Here is a detailed breakdown of all 8 urology cases from your notes:
Urology Final Exam - Case Explanations
CASE 1: Renal Colic
Clinical Presentation
Sudden onset unilateral flank pain, severe and colicky in nature (waxes and wanes, does not fully remit). Associated nausea, vomiting, and hematuria. Pain location shifts depending on stone position: upper ureter → anterior abdominal radiation; lower ureter → radiates to ipsilateral testicle (men) or labium (women); ureterovesical junction (UVJ) → frequency and urgency mimicking cystitis.
Important Differential Diagnoses
- Right UPJ stone: mimics acute cholecystitis
- Lower right ureter: mimics appendicitis
- Lower left ureter: mimics diverticulitis
- UVJ either side: mimics acute cystitis
- Obstructing stone + proximal infection: mimics acute pyelonephritis (pus under pressure = surgical emergency)
Lab Tests to Order
| Test | What to Look For |
|---|---|
| Urinalysis (UA) | Red blood cells (hematuria), WBCs, crystals; note: complete obstruction may show NO RBCs |
| Urine culture | Rule out concurrent infection |
| CBC | Leukocytosis (stress response or infection) |
| Serum creatinine / BMP | Assess renal function; may be reduced with bilateral or solitary kidney obstruction |
| Serum calcium, uric acid | Identify metabolic cause |
| KUB plain film | Limited sensitivity; useful to monitor known stone progress |
Imaging
- Non-contrast CT KUB (first choice) - detects stones as small as 1 mm, identifies hydronephrosis, hydroureter, perinephric fat stranding, and alternative diagnoses. Low-dose technique (2-3 mSv) is preferred in ER. Contrast is NOT used - it does not aid stone detection.
- Ultrasound - good first-line in ED (avoids radiation), detects hydronephrosis and stones in kidney/proximal & distal ureter, but misses mid-ureteral stones obscured by bowel gas and stones <5 mm.
- IVU - older technique, rarely used now; requires IV contrast and up to 8-hour delayed films.
Treatment Options
| Approach | Detail |
|---|---|
| Analgesia | IV/IM NSAIDs (ketorolac) - preferred; fewer side effects than opioids. Opioids (morphine, pethidine) as adjuncts |
| Medical expulsion therapy | Alpha-blockers (tamsulosin 0.4 mg once daily) - facilitates passage of stones 5-10 mm |
| Stones <5 mm | >90% pass spontaneously; observe with hydration |
| Stones >10 mm or failing passage | Urological intervention needed |
| ESWL | Extracorporeal shockwave lithotripsy - for proximal ureteral/renal pelvis stones |
| Ureteroscopy + laser | Flexible/rigid ureteroscopy with laser lithotripsy - for most ureteral stones |
| Percutaneous nephrolithotomy (PCNL) | For large renal stones (>20 mm) or staghorn calculi |
| Emergency drainage | Ureteral stent or percutaneous nephrostomy if obstruction + infection (pus under pressure = urologic emergency) |
CASE 2: Hematuria - Necessary Tests and Exams
Definition
True hematuria = RBCs on microscopic urinalysis. The urine dipstick alone is NOT sufficient - it can give false positives (myoglobinuria, hemoglobinuria, certain foods/drugs). Always confirm with microscopy (midstream clean catch).
Classification
- Gross hematuria - visible to patient; most common cause in patients >50 is bladder cancer
- Microscopic hematuria - incidentally detected on UA
- Timing clues: Initial stream = prostatic/urethral source; terminal = bladder neck; throughout entire stream = upper tract or diffuse bladder
Risk Factors for Malignancy
Older age, smoking, industrial chemical exposure, alkylating chemotherapy, analgesic abuse, chronic foreign body in urinary tract.
Evaluation Algorithm
Step 1 - Rule out benign causes first:
- UTI (especially young women) - treat and recheck
- Nephrologic disease (casts, proteinuria)
- Recent urologic manipulation / trauma
- Anticoagulation / bleeding disorder
Step 2 - Laboratory Tests:
| Test | Purpose |
|---|---|
| Urine microscopy | Confirm true hematuria (>3 RBC/HPF) |
| Urine culture | Rule out infection |
| Urine cytology | Detect urothelial malignancy cells |
| CBC, coagulation profile | Bleeding disorder |
| Serum creatinine | Renal function |
| PSA (men >40) | Prostate cancer |
Step 3 - Imaging:
| Modality | Role |
|---|---|
| CT urography (CTU) - gold standard | Upper tract evaluation: renal masses, urothelial tumors, stones |
| Renal ultrasound | For patients where radiation must be minimized (young women, pregnancy) |
| Retrograde pyelography | When CT is inconclusive for upper tract |
Step 4 - Cystoscopy (mandatory for adults)
- Direct visualization of the bladder mucosa
- Required in all adults with unexplained hematuria to rule out bladder cancer
- Most important test - up to 25% of adults with hematuria have a urologic malignancy
CASE 3: Intermittent Pain in the Left Testis - Young Outpatient
Differential Diagnosis
- Intermittent testicular torsion - most feared
- Epididymitis/orchitis - most common cause of scrotal pain in post-pubertal males
- Varicocele - "bag of worms," left side predominant, dull ache
- Hydrocele / spermatocele - usually painless
- Referred pain (ureteral stone, hernia)
Next Steps
History:
- Duration and frequency of pain episodes; spontaneous resolution?
- Associated nausea, vomiting (torsion)
- Sexual history, urethral discharge (epididymitis - STI)
- Previous similar episodes (intermittent torsion is recurrent)
- Age: torsion peaks at 12-18 years and in neonates
Physical Examination:
- Lie of testis: high-riding transverse lie = torsion
- Cremasteric reflex: absent in torsion (sensitive sign)
- Tenderness: diffuse (torsion) vs. posterior epididymis (epididymitis)
- "Blue dot sign" = torsion of appendix testis
Investigations:
| Test | Finding |
|---|---|
| Scrotal Doppler Ultrasound | Decreased/absent blood flow = torsion; increased flow = epididymitis |
| Urinalysis + urine culture | Pyuria = epididymitis/orchitis |
| Urethral swab (if discharge) | Gonorrhea, chlamydia |
| STI screen (if indicated) | Chlamydia trachomatis most common in young men |
Critical Rule: If torsion is clinically suspected, do NOT delay for imaging - proceed directly to surgical exploration. Testicular viability depends on time: >6 hours significantly worsens salvage rate.
Management:
- Intermittent torsion → elective surgical orchidopexy (bilateral to prevent future torsion)
- Acute torsion → emergency surgical detorsion + bilateral orchidopexy
- Epididymitis (STI likely) → doxycycline 100 mg BD x 14 days + ceftriaxone 500 mg IM single dose; scrotal support, analgesia
- Epididymitis (non-STI, older men) → ciprofloxacin or trimethoprim-sulfamethoxazole x 10-14 days
CASE 4: Young Woman in ER - Fever, Hematuria, Difficulty Urinating
Clinical Picture
This presentation combines lower UTI symptoms (dysuria, frequency, difficulty urinating, hematuria) with systemic signs (fever) and possible upper tract involvement.
Most Likely Diagnoses
- Complicated UTI / Acute Pyelonephritis - fever + urinary symptoms is the classic picture
- Hemorrhagic Cystitis - hematuria, dysuria, frequency (viral - adenovirus; drug-induced; severe bacterial cystitis)
- Ureteral stone with secondary infection
Workup
| Test | Rationale |
|---|---|
| Urinalysis + microscopy | Pyuria, bacteriuria, hematuria, casts |
| Urine culture + sensitivity | Identify organism; guide antibiotic choice |
| Blood cultures x2 | If fever >38.5°C, suspected urosepsis |
| CBC | Leukocytosis (infection); anemia (blood loss) |
| CRP, procalcitonin | Severity of systemic infection |
| Serum creatinine, electrolytes | Renal function |
| Pregnancy test (βhCG) | Exclude ectopic pregnancy |
| Pelvic ultrasound / CT KUB | If upper tract disease, stone, or abscess suspected |
| Cystoscopy | If recurrent hematuria not explained by infection |
Management
- If simple lower UTI (cystitis): 3-5 day course - nitrofurantoin 100 mg BD, or trimethoprim-sulfamethoxazole, or fosfomycin 3g single dose
- If pyelonephritis (fever + CVA tenderness): IV ceftriaxone 1-2 g/day OR IV ciprofloxacin; oral step-down after 24-48 hours; total 10-14 days
- Analgesics (NSAIDs), antipyretics, IV fluids if dehydrated
- Follow-up culture in 5-7 days
CASE 5: 70-Year-Old Drunk Man with Urine Retention in ER
Clinical Assessment
This patient has ACUTE URINARY RETENTION (AUR) - sudden inability to void, painful distended bladder.
Confounding Factor: Alcohol is a diuretic and can exacerbate urinary retention in a man with pre-existing BPH; it can also mask pain making assessment harder.
Check Results (Key Investigations)
| Test | What You're Looking For |
|---|---|
| Bladder ultrasound / bladder scan | Confirm urinary retention (bladder volume >300-400 mL) |
| Serum creatinine + electrolytes | Renal function, post-renal uropathy |
| PSA | Baseline (defer if recent UTI or catheter - will be falsely elevated) |
| Urinalysis + culture | Concurrent UTI |
| CBC | Infection, anemia |
| Blood glucose, electrolytes | Alcohol may cause hyponatremia, hypoglycemia |
| DRE (Digital Rectal Exam) | Assess prostate size, firmness, symmetry |
Tactics (Immediate Management)
- Urethral catheterisation immediately - relieve retention (Foley catheter 14-16 Fr)
- Measure and document residual volume; drain slowly if volume very large to prevent hematuria ex vacuo
- IV/oral fluids - monitor urine output (post-obstructive diuresis possible)
- Watch for post-obstructive diuresis if chronic retention - may need IV fluid replacement
- Do NOT send home drunk - observe until sober; reassess neurological status
What to Prescribe and Treat
| Medication | Dose | Purpose |
|---|---|---|
| Alpha-blocker (tamsulosin) | 0.4 mg once daily | Relax smooth muscle of prostate/bladder neck; facilitates trial without catheter (TWOC) |
| 5-alpha reductase inhibitor (finasteride) | 5 mg once daily | Long-term prostate shrinkage (if confirmed BPH, add to alpha-blocker) |
| Antibiotics | Ciprofloxacin 500 mg BD x 5 days | If UTI present or prophylaxis after catheter |
| Analgesics | Paracetamol, NSAIDs (careful with renal function) | Pain relief |
Trial Without Catheter (TWOC): After 24-48 hours with tamsulosin, remove catheter and assess voiding. Success rate ~50-70% in first episode.
If TWOC fails: Discuss TURP (Transurethral Resection of Prostate) - definitive treatment for BPH-related retention.
CASE 6: Pregnant Woman with Back Pain, Fever, and Dysuria
Diagnosis: Acute Pyelonephritis in Pregnancy
This is the most serious urinary tract infection in pregnancy and a medical emergency.
Key Features
- Fever (universal; >38.5°C is hallmark - diagnosis is suspect if absent)
- Flank/back pain (CVA tenderness)
- Dysuria, frequency, urgency
- 75% of cases are right-sided in pregnancy due to dextrorotation of the uterus by the sigmoid colon causing more prominent right ureteral dilation
- Nausea, vomiting common
Why Pregnancy Makes This More Dangerous
- Up to 20% develop septicemia
- Risk of ARDS in 2-8% (cytokine-mediated vascular injury)
- Risk of preterm labour (endotoxin stimulates uterine contractions)
- Transient renal dysfunction (decreased creatinine clearance)
- DIC and septic shock can occur
Investigations
| Test | Rationale |
|---|---|
| Urine culture + sensitivity | Required; guide antibiotic choice |
| CBC | Leukocytosis, anemia (hemolytic from endotoxemia) |
| Serum creatinine | Monitor renal function |
| Blood cultures | If signs of sepsis or failure to respond to treatment |
| Pulse oximetry | Respiratory insufficiency monitoring |
| Chest X-ray + ABG | If dyspnea/tachypnea (ARDS) |
| Renal ultrasound | Check for obstruction (avoid CT radiation in pregnancy) |
| Fetal CTG (>24 weeks) | Monitor fetal heart rate; uterine activity monitoring |
Treatment
Immediate - Inpatient Management (all pregnant women with pyelonephritis):
- IV crystalloid resuscitation - maintain urine output >30-50 mL/hr; careful to avoid pulmonary edema
- IV antibiotics - start empirically while awaiting cultures
| Antibiotic | Dose | Notes |
|---|---|---|
| Ceftriaxone | 1-2 g IV q24h | First-line; pregnancy safe |
| Cefepime | 2 g IV q8h | Severe cases |
| Ampicillin + Gentamicin | 2g q6h + 5mg/kg q24h | Gentamicin: monitor levels, limit duration due to nephrotoxicity |
| Cefazolin + Aztreonam | Per dosing | Penicillin allergy |
AVOID: Fluoroquinolones (teratogenic risk), TMP-SMX in 1st trimester (folic acid antagonism) and at term (neonatal jaundice).
Oral step-down (after clinical improvement, 12-24h IV):
- Amoxicillin-clavulanate 875/125 mg BD; OR
- TMP-SMX DS (avoid near term)
- Total duration: 10-14 days
Monitor: Vital signs, respiratory rate, urine output, fetal well-being. If contractions persist after rehydration, tocolysis with indomethacin or nifedipine may be considered.
CASE 7: Young Man with Pain in Scrotum
Priority - Rule Out Testicular Torsion First
Scrotal pain in a young male is testicular torsion until proven otherwise. This is a time-sensitive surgical emergency.
Differential Diagnoses (in order of urgency)
| Condition | Key Features |
|---|---|
| Testicular torsion | Sudden severe pain, high-riding testis, absent cremasteric reflex, nausea/vomiting, no fever |
| Torsion of testicular appendage | Localized tenderness at upper pole, "blue dot sign," gradual onset |
| Epididymo-orchitis | Gradual onset, fever, dysuria, tenderness over posterior epididymis, cremasteric reflex present |
| Trauma | History of injury, hematoma |
| Inguinal hernia (incarcerated) | Inguinal mass, bowel symptoms |
| Henoch-Schönlein purpura | Rash, arthralgia, hematuria |
| Fournier's gangrene | Rare, but life-threatening; rapidly spreading necrosis, systemic sepsis |
Clinical Assessment
- Age: Torsion peaks at 12-18 years; epididymitis is more common in sexually active young adults
- Onset: Sudden = torsion; gradual = epididymitis/orchitis
- Cremasteric reflex: Absent in torsion (most sensitive sign)
- Testicular lie: High-riding, horizontal (bell-clapper deformity) = torsion
- Prehn's sign: Lifting scrotum relieves pain in epididymitis but NOT in torsion (unreliable)
Investigations
| Test | Finding |
|---|---|
| Scrotal Doppler ultrasound | Absent/reduced flow = torsion; increased flow = epididymitis. Do NOT delay surgery for this test if clinical suspicion is high |
| Urinalysis | Pyuria = epididymitis |
| STI swab/NAAT | If sexually active and epididymitis suspected |
| CBC, CRP | Infection markers |
Management
- Suspected torsion → emergency surgical exploration within 6 hours (>90% salvage if <6h; <10% salvage if >24h). Perform bilateral orchidopexy.
- Epididymitis (STI): Ceftriaxone 500 mg IM single dose + doxycycline 100 mg BD x 14 days
- Epididymitis (enteric, older/non-STI): Ciprofloxacin 500 mg BD x 10-14 days; or levofloxacin
- Supportive: Scrotal elevation, analgesia (NSAIDs), ice packs (avoid in torsion)
CASE 8: Urinary Catheterisation
Indications
- Acute urinary retention
- Monitoring urine output in critically ill patients
- Post-operative monitoring
- Urinary incontinence management (short-term)
- Instillation of medication (e.g., intravesical chemotherapy)
- Urodynamic studies
Types of Catheters
| Type | Use |
|---|---|
| Foley catheter (indwelling) | Short/long-term retention; self-retaining balloon |
| Intermittent catheter | Clean intermittent self-catheterisation (CISC); preferred for chronic neurogenic bladder |
| Suprapubic catheter | When urethral route is impossible (stricture, trauma, prostate obstruction) |
| 3-way catheter | Continuous bladder irrigation (post-TURP, haematuria with clots) |
Procedure (Male Urethral Catheterisation)
- Explain procedure, obtain consent
- Aseptic technique - sterile gloves, drape, sterile catheter pack
- Clean glans penis with antiseptic solution (chlorhexidine)
- Apply lidocaine gel (e.g., instillagel) into urethra; wait 3-5 minutes for anaesthesia
- Hold penis vertically at 90° to straighten urethra
- Gently insert Foley catheter (14-16 Fr standard size) - advance slowly
- Resistance at external sphincter: ask patient to breathe deeply, advance gently
- Inflate balloon with 10 mL sterile water only AFTER urine freely drains to confirm position in bladder
- Gently pull catheter back until resistance felt
- Connect to closed drainage bag; secure catheter to inner thigh
- Document residual volume
Female catheterisation: Shorter urethra (~4 cm); identify urethral meatus between clitoris and vaginal introitus; use good lighting and positioning (frog-leg). Same sterile technique.
Complications
| Complication | Notes |
|---|---|
| Catheter-associated UTI (CAUTI) | Most common; use catheters only when necessary |
| Urethral trauma / false passage | Never force; if resistance, try smaller catheter or call urology |
| Paraphimosis | Replace foreskin after procedure |
| Balloon inflation in urethra | Avoid: always confirm urine flow first |
| Post-obstructive haematuria | Drain slowly if large volumes |
| Bypassing / leakage | Bladder spasm, incorrect size, blockage |
Sources: Campbell-Walsh-Wein Urology; Bailey and Love's Short Practice of Surgery; Creasy and Resnik's Maternal-Fetal Medicine; National Kidney Foundation Primer on Kidney Diseases.
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