Critically ill patient recovering from a surgery develops right upper quadrant pain. What is the probable diagnosis: (A) calculous cholecystitis, (B) Acalculous cholecystitis, (C) Empyema of gallbladder, (D) Porcelain gallbladder.
Answer is B. Acalculous cholecystitis is found in critically ill patients and patients recovering from major surgery, trauma and burns.