Fibromatosis are rare, accounting for 0.03% of all tumours. Mesenteric
fibromatosis is a very rare (8% of all
desmoid neoplasm).
Aggressive fibromatosis of mesentery is a rare surgical problem affecting 2-4 per million people. Females are more commonly affected than males (
Estrogen acts as a
growth factor). It is locally invasive and tends to recur but never metastasize. Here, we are discussing about 24-year-old male presented with progressive abdomen distension associated with
pain since one month. Abdominal examination showed a firm non-tender intra-abdominal mass, measuring around 15x14 cm size, with intrinsic mobility, which was perpendicular to mesenteric line, all borders were well-made out. CECT abdomen showed features suggestive of GIST . Elective
Laparotomy was done and a giant mass arising from mesentery without any infiltration to the surrounding structures was noted. The entire mass was excised and mesentery repaired. Histopathology showed uniform band of spindle shaped cells arranged in fascicles admixed with blood vessels in a collagenous stroma. Immunohistochemistry showed
Beta Catenin +ve, CD 117-ve, CD 34 -ve and SMA-ve, which is confirmative of
Fibromatosis. Postoperative period was uneventful.