A 45-year-old farmer from Rajasthan presents with right upper quadrant pain and hepatomegaly. Ultrasound shows a large cyst in the right lobe of the liver with multiple internal small cystic lesions arranged in a honeycomb pattern, as marked **A** in the diagram. The cyst wall appears echogenic and laminated. Based on the WHO-IWGE ultrasound classification, what is the stage of this hydatid cyst, and what is the most appropriate initial management?
A. CE2 stage; surgical pericystectomy or partial hepatectomy under albendazole cover
B. CE1 stage; percutaneous PAIR (Puncture, Aspiration, Injection, Re-aspiration) under albendazole cover
C. CE3a stage; percutaneous PAIR with hypertonic saline injection
D. CE4 stage; observation alone without intervention
Explanation
Why CE2 stage; surgical pericystectomy or partial hepatectomy under albendazole cover is right
The structure marked A — a large mother cyst with multiple internal daughter cysts arranged in a honeycomb or rosette pattern — is the defining ultrasound feature of CE2 (multivesicular/multiseptate, active stage) according to WHO-IWGE classification. CE2 cysts are active and contain multiple daughter cysts, making them unsuitable for percutaneous PAIR, which is less effective on multivesicular lesions. The standard-of-care management for CE2 is surgical intervention (pericystectomy or partial hepatectomy) under albendazole cover (10–15 mg/kg/day for 1 month before and 1–6 months after surgery) to reduce recurrence and manage any spillage of protoscoleces. This is consistent with WHO-IWGE expert consensus and Harrison's 21e guidance on hepatic echinococcosis management.
Why each distractor is wrong
CE1 stage; percutaneous PAIR under albendazole cover: CE1 is a unilocular anechoic cyst with a visible cyst wall (simple, not multivesicular). The honeycomb/rosette appearance with daughter cysts is CE2, not CE1. PAIR is appropriate for CE1 and CE3a, not CE2.
CE3a stage; percutaneous PAIR with hypertonic saline injection: CE3a shows a "water lily" sign (detached endocyst floating in fluid), not a honeycomb pattern. The image described is CE2, not CE3a. Although PAIR can be used for CE3a, the imaging findings do not match this stage.
CE4 stage; observation alone without intervention: CE4 is degenerated (heterogeneous "ball of wool" appearance) and inactive, requiring only observation. The honeycomb pattern with active daughter cysts indicates an active stage (CE2), not CE4. Active cysts require intervention.
High-YieldNEET PG
CE2 hydatid cysts (multivesicular/honeycomb) require surgery, not PAIR; PAIR is reserved for CE1 and CE3a. Always give albendazole perioperatively.
WHO-IWGE expert consensus; Harrison's 21e
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