Epiploic appendagitis

Acute epiploic appendagitis is an uncommon cause of abdominal pain whose diagnosis is primarily based on CT findings. It refers to inflammation of the epiploic appendages, which are peritoneal outpouchings that arise from the serosal surface of the colon, containing adipose tissue and vessels. The inflammation of epiploic appendages can be the result of torsion or venous occlusion. It has a benign self limited course , and is managed conservatively. The most common CT appearance of acute epiploic appendagitis is the presence of 1.5- to 3.5-cm-diameter fat-density lesion with surrounding inflammatory changes abutting the anterior wall of the sigmoid colon (1). They are most commonly located in the sigmoid colon.
Differential diagnosis of epiploic appendagitis includes mesenteric panniculitis, acute diverticulitis, trauma, or an omental neoplasm such as a liposarcoma. Omental infarction can sometimes mimic epiploic appendagitis. CT features of omental infarction typically consist of a right lower quadrant well-circumscribed nonenhancing oval soft-tissue mass without the hyperdense ring, that is typically located deep to the anterior abdominal muscles .