RESUMEN
Fibromatosis is a rare, locally aggressive but non-metastasising fibrous mass often associated with familial adenomatous polyposis in Gardner's Syndrome (GS). Although sporadic cases occur, unlike in GS, they are predominantly extra-abdominal. We report the case of a 40-year-old lady who underwent laparotomy for a large isolated abdominal mass three years after a Whipple's procedure for adenocarcinoma of the distal common bile duct. A spherical, football sized tumour was found in the jejunal mesentery. Resection of the tumour with jejunum was carried out. No metastasis was detected. This case is peculiar in that mesenteric fibromatosis occurred in a patient with prior history of periampullary carcinoma and without history of familial adenomatous polyposis.