A 38-year-old man presents to the emergency department with acute onset left-sided colicky flank pain radiating to the groin. He has nausea and mild hematuria on urinalysis. Non-contrast CT abdomen-pelvis (NCCT) shows a 6 mm stone in the left proximal ureter with mild hydronephrosis. Serum creatinine is 1.0 mg/dL, and he is afebrile. What is the most appropriate initial management?

Explanation

## Clinical Context This patient presents with a classic presentation of uncomplicated ureteric colic: acute flank pain, hematuria, and imaging confirmation of a small stone (6 mm) in the proximal ureter with mild hydronephrosis. Renal function is normal and there are no signs of infection or complete obstruction. ## Management Principles for Uncomplicated Ureteric Stones **Key Point:** Stones <6 mm have a 90% spontaneous passage rate within 4–6 weeks; stones 6–10 mm have a 50% passage rate. Conservative management (watchful waiting) is the gold standard for uncomplicated cases. **High-Yield:** The "STONE" score and clinical judgment guide intervention: - **S** = Stone size >6 mm - **T** = Tract anatomy abnormality - **O** = Obstruction (complete) - **N** = Nausea/vomiting (uncontrolled) - **E** = Elevated creatinine In this case, none of these adverse factors are present. ## Conservative Management Protocol 1. **Analgesia:** NSAIDs (diclofenac 75 mg IM/IV) or opioids for pain control 2. **Hydration:** Encourage oral fluids (target urine output 2–3 L/day) to promote stone passage 3. **Imaging follow-up:** Repeat NCCT at 4–6 weeks to document stone passage or progression 4. **Alpha-blockers:** Tamsulosin 0.4 mg daily may improve passage rates (especially for distal ureteric stones) **Clinical Pearl:** Spontaneous passage is more likely with: - Stone size <6 mm - Proximal or mid-ureteric location (paradoxically, proximal stones have better passage rates than distal) - Absence of anatomical abnormality - Good renal function ## Why Other Options Are Incorrect - **Percutaneous nephrostomy:** Reserved for obstructed infected systems (pyonephrosis), complete obstruction with renal failure, or failed conservative management—not indicated here. - **Ureteroscopy:** Indicated for symptomatic stones >10 mm, complete obstruction, recurrent colic despite analgesia, or failed conservative passage (typically after 4–6 weeks)—premature in this case. - **Open ureterolithotomy:** Obsolete; reserved only for rare cases of failed endoscopic management or anatomical contraindications. ## Follow-up Strategy If the stone does not pass by 4–6 weeks, or if pain becomes uncontrolled, then semi-rigid or flexible ureteroscopy with holmium laser lithotripsy is the next step [cite:Smith-Bindman et al. NEJM 2004]. **Mnemonic:** **"WAIT & WATCH"** for uncomplicated stones <10 mm: - **W** = Watchful waiting - **A** = Analgesia and hydration - **I** = Imaging at 4–6 weeks - **T** = Track symptom resolution - **W** = When passage fails → Ureteroscopy - **A** = Alpha-blockers may help - **T** = Time limit: 4–6 weeks - **C** = Complete obstruction or infection → intervene urgently - **H** = Hydronephrosis mild → conservative safe