Gallbladder gangrene on transabdominal ultrasound

Transabdominal ultrasound of a gangrenous gallbladder showing evidence of necrotic and denuded mucosa. The longitudinal view of the base of the gallbladder (A) shows a distended gallbladder, with multiple stones within gallbladder sludge (thin yellow arrow) casting an acoustic shadow (thick yellow arrow). The longitudinal view of the fundus (B) demonstrates denuded mucosa (yellow arrowhead), indicating early necrosis of the gallbladder wall.