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Primary Cutaneous Extraskeletal Osteosarcoma of the Temple Treated by Mohs Micrographic Surgery.

We present a case of primary cutaneous extraskeletal osteosarcoma (ESOS) of the temple successfully treated by Mohs micrographic surgery (MMS). ESOS is a malignant mesenchymal tumor comprising neoplastic cells producing bone, osteoid, and/or chondroid material. ESOS is uncommon and accounts for approximately 1% to 4% of all osteosarcomas. ESOS occurs primarily in the deep soft tissues of the lower or upper extremities and retroperitoneumwithout connection to the underlying bone or periosteum. Only 10% are superficially located. Primary cutaneous ESOS is exceptionally rare representing less than 25 cases published within English-language journals.