Background: Omental masses can histologicaly correspond to several entities, for instance, epiploic tumors, omental infarction, acute diverticulitis, acute appendicitis, traumatisms and so on.Case Report: We report on a case of a 47 year-old male who presented with abdominal pain in the right upper quadrant. Abdominal examination objectified a painful bulk in this location. Abdominal CT-scan showed a mass surrounded by huge inflammatory changes in the fat tissue (omentum). The patient underwent surgical operation and a 10 centimetres in diameter mass was removed. No postoperative complication was recorded. Conclusions: Histological examination found a necrosed omental lipoma. We discuss the possible diagnosis.

Keywords: Lipoma, Omentum, omental infarction, Liposarcoma, leiomiosarcoma, Fibrosarcoma