Advanced Sinonasal Malignant Melanoma; A Case Report.

Malignant melanoma of the sinonasal area is a rare tumor that arises from melanocytes in the nasal mucosa and is more aggressive than the cutaneous type with a poor prognosis. We report a 60-year-old female with the initial chief complaint of nasal cavity fullness, continuous epistaxis, and nasal bone deformity in the past two months. In a primary examination, a black mass was found, and in an excisional biopsy, the pathologist reported sinonasal malignant melanoma, which was confirmed after IHC staining. In spindle cell tumors of the head and neck area, we should be aware of mucosal malignant melanoma as a differential diagnosis.