A 42-year-old man presents to the emergency department with sudden-onset severe left flank pain radiating to the groin. He has nausea and mild hematuria. Non-contrast CT (NCCT) abdomen shows a 6 mm stone in the left ureter at the level of the pelvic brim with mild hydronephrosis. His serum creatinine is 1.0 mg/dL, and he is afebrile with a normal white cell count. What is the most appropriate initial management?

Explanation

## Management of Small Ureteric Stones **Key Point:** Small ureteric stones (≤6 mm) in asymptomatic or minimally symptomatic patients with normal renal function have a high spontaneous passage rate (68–90%) and should be managed conservatively as first-line. ### Clinical Rationale **High-Yield:** The 6 mm stone size is below the threshold for intervention in uncomplicated cases. The patient has: - No fever or signs of infection (afebrile, normal WBC) - Normal renal function (creatinine 1.0 mg/dL) - Mild hydronephrosis only - Uncomplicated presentation These factors indicate this is NOT an emergency requiring immediate intervention. ### Conservative Management Protocol 1. **Analgesia:** NSAIDs (ibuprofen, indomethacin) or opioids for pain control 2. **Hydration:** Encourage oral fluid intake (2–3 L/day) to increase urine flow and facilitate stone passage 3. **Alpha-blockers:** Tamsulosin 0.4 mg daily may improve passage rates (especially for distal ureteric stones) 4. **Follow-up imaging:** Repeat NCCT at 4 weeks; if stone persists or symptoms worsen, consider intervention ### Indications for Urgent Intervention | Scenario | Action | |----------|--------| | Fever + hydronephrosis (obstructive pyelonephritis) | Urgent ureteric stent/PCN + antibiotics | | Solitary kidney + obstruction | Urgent decompression | | Renal failure (Cr >1.5) + obstruction | Urgent intervention | | Stone >10 mm or recurrent passage failure | Ureteroscopy/ESWL | | Intractable pain/vomiting | Consider intervention | **Clinical Pearl:** The "watchful waiting" approach with analgesia and hydration is standard of care for uncomplicated stones <6 mm, as 80% pass spontaneously within 4 weeks. Premature intervention increases morbidity (ureteric stricture, perforation) without benefit in this cohort. **Mnemonic: STONE PASSAGE** — **S**mall (<6 mm), **T**emperature normal, **O**bstruction mild, **N**ormal renal function, **E**ncourage fluids → **P**assive management, **A**nalgesia, **S**erial imaging, **S**urgery only if failure, **A**lpha-blockers optional, **G**reat spontaneous passage rate, **E**xpect 4-week resolution.