Solitary fibrous benign mesothelioma of the peritoneum: Report of a case

A 66-year-old Japanese man who had undergone a subtotal gastrectomy for gas tric cancer 1 year earlier, and was asymptomatic, underwent a computed tomo graphy scan during a detailed follow-up examination, which revealed a pancr eatic mass. Abdominal ultrasonography showed a solid turner containing a cy stic lesion, and abdominal magnetic resonance demonstrated a tumor with low intensity on T1-weighted images and high intensity on T2-weighted images. Although an abdominal angiography added no new information to help in estab lishing a preoperative diagnosis, it showed an avascular mass. An endoscopi c retrograde pancreatograhy showed compression and deviation of the body pa rt of the pancreatic duct, and dilatation of its caudal part. At laparotomy , an elastic soft tumor was found to originate from the peritonenm of the o mental bursa in front of the pancreas, The tumor was encapsulated and solid . The solid lesion consisted of spindle-shaped cells, but no atypical cells were observed, The histological findings were diagnostic of a benign solit ary fibrous mesothelioma, which is extremely rare. The patient is currently well and disease-free more than 5 years after this operation.