[A case of chondromyxoid fibroma of the frontal bone].

A case of chondromyxoid fibroma of the skull is reported. A 20-year-old boy visited our clinic on December, 1982 because of a recurrent forehead tumor. He had a 4 X 4 X 1.5 cm tumor on the right side of forehead and a 3 X 3 X 0.5 cm tumor on the left. Neurological examination showed no abnormalities. Skull X-ray film showed a large round radiolucent area with clear sclerotic margin in the frontal bone and right orbit. Right carotid angiogram showed marked posterior displacement of the anterior cerebral artery, but no tumor stain. Plain CT scan showed a mass with iso to low density area in the frontal region. It was markedly and irregularly enhanced with contrast media. Surgery was performed entirely in the epidural space, and the tumor was completely removed. The post-operative clinical course was uneventful. Histologically, the three components of chondroid, myxomatous and fibrous tissues in this tumor led to the diagnosis of "chondromyxoid fibroma."