Abstract
A 41-year-old man was discovered to have a pelvic mass during investigation for hypertension 2 years ago. Otherwise, he was asymptomatic, and abdominal magnetic resonance imaging revealed a highly vascular solid mass superior to the urinary bladder. A (131)I-meta-iodobenzylguanidine whole body scan was reported as normal, which ruled out the possibility of extra-adrenal pheochromocytoma. No definitive preoperative diagnosis could be established. Surgical resection of the tumour revealed mesenteric Castleman's disease, hyaline vascular type. Such a diagnosis should be considered for any abdominal vascular mass. [Asian J Surg 2010;33(3):150-3]