Large frontal osteoid osteoma with orbital extension

Abstract

Osteoid osteomas are benign bone tumors first described by Jaffe in 1935. They are usually located within the cortex of long bones in the lower extremities. These types of tumors are rare in the skull area, representing less than 1% of benign cases. We present a case of a large osteoid osteoma producing proptosis and requiring a frontal sinusotomy with excision of the mass.