MELANOMA BOTRYOIDES - A DISTINCTIVE MYXOID PATTERN OF SINONASAL MALIGNANT-MELANOMA

Two primary sine-nasal melanomas are presented which were characterized by their botryoid growth pattern and myxoid stroma. These polypoid tumours contained small amounts of melanin and only focal areas of epithelioid cells. An in situ component was present in both of the tumours. Malignant melanoma should be considered when confronted by a myxoid tumour (with or without melanin) in the sine-nasal region. These tumours are widely infiltrative, and there is no evidence to suggest that they will behave any differently from conventional, non-botryoid, non-myxoid sine-nasal melanomas.