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EasyGastroenterologyAcute cholecystitisau-amc

A 42-year-old man presents with right upper quadrant pain and tenderness. Ultrasound demonstrates gallstones with thickened gallbladder wall and positive sonographic Murphy's sign but no bile duct dilatation. He is febrile at 38.2 °C and WBC is elevated. What is the most likely diagnosis?

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