A 38-year-old man from Delhi presents to the emergency department with acute left-sided flank pain radiating to the groin, nausea, and haematuria. Non-contrast CT (NCCT) abdomen confirms a 6 mm left ureteric stone at the pelvic brim with mild hydronephrosis. Serum creatinine is 1.0 mg/dL, and urine culture is sterile. Vital signs are stable, pain is controlled with NSAIDs. What is the most appropriate next step in management?

Explanation

## Clinical Context This is an uncomplicated ureteric stone with normal renal function, no infection, and stable vital signs. The stone is small (6 mm) and located at a common site of impaction (pelvic brim). ## Management Algorithm for Ureteric Stones ```mermaid flowchart TD A[Ureteric stone diagnosed]:::outcome --> B{Stone size & location?}:::decision B -->|< 6 mm, no obstruction| C[Conservative: hydration + analgesia]:::action B -->|6-10 mm, assess impaction| D{Impaction risk?}:::decision B -->|> 10 mm or infected| E[Intervention required]:::action C --> F[Follow-up NCCT at 4 weeks]:::action D -->|Low risk| G[Conservative trial]:::action D -->|High risk| E E --> H{Renal function & anatomy?}:::decision H -->|Normal, accessible| I[Ureteroscopy ± laser]:::action H -->|Impaired or complex| J[PCNL or staged approach]:::action ``` ## Key Point: **Expectant management (watchful waiting) is the first-line approach for uncomplicated stones < 6 mm with normal renal function, no infection, and no obstruction.** Approximately 50–70% of such stones pass spontaneously within 4 weeks. ## High-Yield Facts: - **Stone size < 6 mm**: ~90% spontaneous passage rate - **Stone size 6–10 mm**: ~50% spontaneous passage rate - **Stone size > 10 mm**: <10% spontaneous passage rate → intervention indicated - **Indications for immediate intervention**: fever + obstruction (infected obstructed kidney), uncontrolled pain, solitary kidney, bilateral obstruction, renal insufficiency, pregnancy ## Clinical Pearl: The pelvic brim is a common impaction site for ureteric stones, but a 6 mm stone at this location still has a reasonable chance of passage. The absence of fever, normal renal function, and controlled pain favour conservative management. ## Tip: Remember the **"3 Ps" of expectant management**: 1. **Pain control** (NSAIDs or opioids as needed) 2. **Prophylaxis** (adequate hydration, urate-lowering agents if indicated) 3. **Patience** (4-week follow-up imaging) [cite:Smith-Bindman et al., Urology 2005; AUA Guidelines on Nephrolithiasis]