Localized intra-abdominal fibromatosis of the small bowel mimicking a gastrointestinal stromal tumor: A case report

Figure 1 Abdominal CT scan showing a round, lobulated mass in the mesenteric region, tightly related to the bowel wall.

Figure 2 The resected small bowel with a well circumscribed firm mass in the mesenteric adipose tissue which exhibits an expanding growth pattern (A). The tumor has a tan-gray appearance on cut surface, and focally infiltrates the bowel wall (B).

Figure 3 The tumoral lesion consisted of spindle cells growing in sweeping fascicles, with eosinophilic cytoplasm and sometimes plump nuclei (A, H&E 400×). Most of the tumor cells show immunoreactivity for c-kit (CD117) in their cytoplasm (B, IHC 400×). Immunohistochemical stain for smooth muscle actin (C, IHC 200×) and for desmin (D, IHC 200×) is also present in some hypercellular areas of the lesion.