title: Haemangiopericytoma of the sigmoid mesentery.
abstract: Haemangiopericytoma is a rare, vascular soft tissue tumour originating from the pericytes surrounding capillaries. We report a case of haemangiopericytoma in the sigmoid mesocolon and are aware of only one previously case. A 61-year-old man was referred with a left iliac fossa mass. At operation, a 10-cm diameter mass was found to be arising from the sigmoid mesentery (Fig. 1). The mass did not involve the bowel wall and there was no clinical evidence of metastatic disease. A sigmoid colectomy with primary anastomosis was performed. The patient made an uneventful recovery. Pathological assessment of the specimen revealed a 95 x 70 x 50 mm(3), purple, lobulated mass within the sigmoid mesocolon adjacent to the bowel. Immunohistological analysis (positive CD34, focal factor VIII) was consistent with a diagnosis of a haemangiopericytoma. Complete excision with adequate margins remains the treatment of choice. We therefore suggest that patients be carefully followed for long periods and advised of the risk of long-term relapse.
authors.affiliation: Department of Surgery, Epsom General Hospital, Dorking Road, Epsom, Surrey, United Kingdom KT16 9SE.
authors.forename: N J
authors.initials: NJ
authors.lastname: West
authors.forename: I R
authors.initials: IR
authors.lastname: Daniels
authors.forename: W H
authors.initials: WH
authors.lastname: Allum
mesh_terms: D003082:Colectomy; D012809:Colon, Sigmoid; D006393:Hemangiopericytoma / Q000473:pathology* / Q000601:surgery; D006801:Humans; D008297:Male; D008646:Mesocolon / Q000473:pathology*; D008875:Middle Aged; D010534:Peritoneal Neoplasms / Q000473:pathology* / Q000601:surgery; D016896:Treatment Outcome