Encapsulated cyst fat necrosis masquerading as cold abscess

Encapsulated fat necrosis is a benign, usually asymptomatic and underreported condition. It is believed to be trauma‐related ischemia and necrosis of fat tissue that gradually detaches from its surroundings. Here we reported a case of encapsulated cyst fat necrosis in a 75 years old female following intramuscular injection, who was clinically diagnosed as cold abscess initially.

Sonography of Encapsulated Fat Necrosis with Histologic Correlation

.