A 38-year-old man presents to the emergency department with acute right flank pain radiating to the groin. He has nausea and is writhing in discomfort. Vital signs: BP 140/90 mmHg, HR 98/min, RR 20/min, temperature 37.2°C. Urinalysis shows haematuria (3+) and crystals. Non-contrast CT abdomen (gold standard) reveals a 6 mm radiopaque stone in the right ureter at the pelvic brim. What is the most appropriate immediate management?

Explanation

## Management of Uncomplicated Ureteric Stones **Key Point:** Small ureteric stones (< 6 mm) have a high spontaneous passage rate (up to 90%), making conservative management the standard first-line approach in uncomplicated cases. ### Rationale for Conservative Management 1. **Stone size and location**: A 6 mm stone at the pelvic brim is at the narrowest part of the ureter, but stones ≤ 6 mm pass spontaneously in the majority of cases within 4–6 weeks. 2. **Patient stability**: No fever, no signs of infection, normal renal function implied, and no obstruction-related complications. 3. **Symptom control**: Adequate analgesia (NSAIDs or opioids) and antiemetics allow patient comfort during passage. 4. **Cost-effectiveness**: Avoids unnecessary invasive procedures and their associated morbidity. ### Conservative Management Protocol - **Analgesia**: NSAIDs (e.g., indomethacin 50 mg TDS) or paracetamol + opioids as needed - **Hydration**: Encourage oral intake or IV fluids if unable to tolerate oral intake - **Antiemetics**: Ondansetron or metoclopramide for nausea - **Follow-up imaging**: Repeat non-contrast CT or KUB X-ray at 4 weeks to confirm passage - **Strain urine**: To capture stone for analysis ### When to Escalate to Intervention | Indication | Intervention | | --- | --- | | Stone > 6 mm | ESWL or ureteroscopy | | Fever + obstruction (infected obstructed kidney) | Urgent drainage (JJ stent or nephrostomy) + antibiotics | | Persistent pain despite analgesia | Ureteroscopy | | Solitary kidney with obstruction | Urgent intervention | | Renal insufficiency from bilateral obstruction | Urgent drainage | **Clinical Pearl:** The "4 Ps" of ureteric stone passage: **P**ain control, **P**erfect hydration, **P**atience (4–6 weeks), **P**eriodic imaging. **High-Yield:** Stones < 5 mm: 95% pass spontaneously; 5–10 mm: 50% pass; > 10 mm: 10% pass without intervention [cite:Urology Textbook]. --- ## Why Other Options Are Incorrect **Immediate ureteroscopy**: Reserved for large stones (> 10 mm), infected obstructed kidneys, or failure of conservative management. Invasive, risks ureteric perforation and stricture formation. **ESWL**: Effective for renal and upper ureteric stones, but less ideal for mid/lower ureteric stones due to acoustic window and pelvic bone interference. Also not first-line for small stones expected to pass spontaneously. **PCNL**: Indicated for large renal stones (> 20 mm), staghorn calculi, or failed ESWL. Highly invasive with significant morbidity (bleeding, infection, perforation). Inappropriate for a small, uncomplicated ureteric stone.