[Pelvic fibromatosis, as a cause of abdominal mass].

Pelvic fibromatosis was found in a 26-year-old patient who was operated on for a possible uterine myoma. The histopathological diagnosis revealed an idiopathic retroperitoneal fibrosis. A second operation was performed in order to complete the exercise of the mass. Immunohistochemical techniques backed the initial diagnosis of pelvic fibromatosis.