Figure 9a. Mesenteric fibromatosis in a 55-year-old woman with a history of hysterectomy and ureteral reimplantation who presented with signs and symptoms of small bowel obstruction. Contiguous CT scans with intravenous and oral contrast material enhancement show a homogeneously attenuating soft-tissue mass (*) in the small bowel mesentery. The mass has ill-defined borders (arrow in a) along its right margin in contact with adjacent small bowel segments.