SOLITARY FIBROUS TUMOR OF THE MESENTERY

We report a solitary fibrous tumor of the abdominal cavity that Presen ted as an encapsulated mass attached to the mesentery in a 33-yr-old m an. Histologically, the lesion showed a disorganized arrangement of sp indle cells in a collagenous background and prominent vascular channel s of varying size. Tumor cells showed immunohistochemical reactivity f or vimentin only. Cytokeratins and CD34 were negative. This report fur ther extends the anatomic range of solitary fibrous tumor, a neoplasm that must be included in the differential diagnosis of well-defined ab dominal masses. The behavior of this mesenteric solitary fibrous tumor has been benign.