Abstract
Fibromatosis is a kind of spindle cell tumor which is characterized by the remarkable proliferation and invasive growth of fibrous tissue. It often arises from the abdominal wall or the extremities and rarely from the mesentery and abdominal organs. The patient was 35 year old female whose major complaints were an abdominal mass and pain. She underwent a right hemicolectomy after the tumor was confirmed by abdominal ultrasonography and computerized tomography. Hereby the pathophysiology, diagnosis and the treatment of the disease is discussed.