Subhepatic appendicitis may clinically mimic cholecysitis. US and CT help in differentiation.

An appendicolith is calcified debris within the appendix, and a risk factor for appendicitis. An appendicolith gives an acoustic shadow at ultrasound.

The case is courtesy of Dr/ Leila Zitouni, Consultant Radiology and Dr/ Bashar Raad, Surgery Consultant,  RCMC.