Figure 4b. Mesenteric fibromatosis in a 48-year-old man who complained of abdominal fullness. (a) Abdominal radiograph obtained with the patient supine shows a large, oval, soft-tissue mass (arrows) in the upper abdomen that displaces the transverse colon inferiorly. (b) CT scan with intravenous and oral contrast material enhancement shows a well-defined, oval, nonenhancing, hypoattenuating mass in the region of the transverse mesocolon.