Abstract
A 61-year-old man with a palpable mass lesion in the lower part of the abdomen was referred to our hospital for investigation and treatment. Laboratory data revealed a severe leukocytosis and a high C-reactive protein (CRP) level ; he did not have a fever. CT and MRI showed a large tumor in the lower abdomen. Based on 3D (vascular reconstruction)-enhanced CT the tumor was found to be fed by the ileocolic artery. The preoperative diagnosis was of a tumor arising from the ileal mesentery. A partial resection of the ileum was done. On histopathology, rounded histiocyte-like and spindle fibroblast-like tumor cells were arranged in a random or haphazard fashion and showed a storiform pattern ; there was a collection of xanthoma-like foamy cells and invasive inflammatory cells. A diagnosis of inflammatory malignant fibrous histiocytoma of the ileal mesentery was made. The postoperative course was uneventful and, the patient's severe leukocytosis improved immediately. The patient has remained disease-free for 2 years since the resection.
