A 32-year-old man presents to the emergency department with acute onset severe left loin-to-groin colicky pain, nausea, and restlessness. Urinalysis shows microscopic haematuria. A non-contrast CT KUB (low-dose stone protocol) is performed. The structure marked **A** in the diagram shows a hyperdense ureteric calculus measuring 8 mm with Hounsfield density of 480 HU. Which of the following is the most appropriate initial management strategy for this patient?
A. Medical expulsive therapy with tamsulosin 0.4 mg once daily plus analgesia and IV fluids
B. Immediate ureteroscopy with holmium:YAG laser lithotripsy
C. Percutaneous nephrostomy placement
D. Extracorporeal shock wave lithotripsy (ESWL)
Explanation
Why Medical expulsive therapy with tamsulosin 0.4 mg once daily plus analgesia and IV fluids is right
The structure marked A is a hyperdense ureteric calculus measuring 8 mm with a Hounsfield density of 480 HU. According to Campbell-Walsh Urology, stones ≤10 mm in the distal ureter without complications are ideal candidates for medical expulsive therapy (MET). The low Hounsfield density (<500 HU) suggests a uric acid stone, which is amenable to medical management and alkalinisation. Tamsulosin 0.4 mg once daily, an alpha-1A selective blocker, relaxes distal ureteric smooth muscle and facilitates spontaneous passage. Initial management also includes NSAIDs (diclofenac IM/IV preferred over opioids for colic), IV fluids for hydration, and anti-emetics for nausea. This conservative approach has high success rates for small stones without complications.
Why each distractor is wrong
Immediate ureteroscopy with holmium:YAG laser lithotripsy: While ureteroscopy is the first-line definitive treatment for ureteric stones, it is reserved for stones >10 mm, obstructing solitary kidney, bilateral obstruction, infected obstructed system, or failed MET. This 8 mm stone without complications should first be managed conservatively.
Extracorporeal shock wave lithotripsy (ESWL): ESWL is appropriate for proximal ureteric stones <10 mm, but this stone is in the distal ureter and is better managed with MET. Additionally, the low Hounsfield density suggests uric acid composition, which responds well to medical management.
Percutaneous nephrostomy placement: Percutaneous nephrostomy is indicated only for infected obstructed systems (urosepsis) or when urgent decompression is needed. This patient has uncomplicated obstruction without signs of infection or sepsis.
High-YieldNEET PG
Stones ≤10 mm in the distal ureter without complications → MET with tamsulosin; stones <500 HU → uric acid (medical management); stones >1000 HU → calcium oxalate monohydrate (resistant to ESWL, needs URS).
Campbell-Walsh Urology, 12th ed; Bailey & Love, 28th ed
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