Osteoma infiltrated by schwannoma in sinonasal region: radiologically masquerading as a malign tumor

Neoplasms in sinonasal cavity are dominated by epithelial type. Sinonasal osteomas common, benign, slow-growing, often asymptomatic neoplasms occurring mainly the frontal and ethmoid sinuses. Peripheral nevre sheath tumors soft tissue rarely encountered region. Schwannoma is a benign peripheral tumor. Here, we presented co-occurence of osteoma schwannoma. So far, infiltrated schwannoma region not reported English literature. Additionally it was masquerading as malignant tumor radiologically. The pathologist should be aware second soft-tissue that may accompanied radiologically suspicious bone lesions.