Pelvic fibromatosis was found in a 26-year-old patient who was operate
d on for a possible uterine myoma. The histopathological diagnosis rev
ealed an idiopathic retroperitoneal fibrosis. A second operation was p
erformed in order to complete the exeresis of the mass. Immunohistoche
mical techniques backed the initial diagnosis of pelvic fibromatosis.