[Ossifying fibromyxoid tumor]

Ossifying fibromyxoid tumor (OFMT) is a rare tumor of unknown histogenesis. It consists of chains and trabecules of ovoid cells in the fibromyxoid stroma (ICD code 8842/0). Tumor is frequently surrounded in part by a capsule of laminar bone. It is more frequent in males 14-79 years of age, mean 44 years. Soft tissues of extremities is a preferable location, but body, neck, oral cavity, mediastinum and retroperitoneal tissue can also be the site of OFMT. More than 100 OFMT cases are reported abroad. It is frequently masked by other tumors of soft tissues. We describe 3 cases in our country: 2 in 65 and 66 year old females and in a 44 year old male. Lipoma and soft tissue sarcoma were suspected clinically. Fibroblasts were found cytologically before operation in one case. Diagnosis was established after total biopsy of the tumor. One of the females is under observation after the operation without recurrence during more than two years. Preoperative diagnosis is sometimes possible when characteristic osteoblastic foci are observed.