Primary mesenteric angiosarcoma in an adult presenting with peritonitis: A case report and review of literature

Primary mesenteric angiosarcoma is a rare soft tissue tumour accounting for 1%–2% of soft tissue tumours. Because of the ubiquity of blood vessels and lymphatics, it can occur anywhere with a poor prognosis. To the best extent of our literature search, this type of tumour is sparsely reported in our environment; we hereby report a case of primary mesenteric angiosarcoma in a 32-year-old man who presented with acute abdomen, intraperitoneal haemorrhage, and shock. Abdominal ultrasound revealed intraperitoneal collection, and intraoperative findings revealed haemoperitoneum 1.5l with vascular cystic tumour at the mesentery close to the duodenojejunal junction. Histopathological examination of the resected specimen revealed angiosarcoma. The patient was seen last at follow-up in early 2022.