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

Two primary sine-nasal melanomas are presented which were characterize d by their botryoid growth pattern and myxoid stroma. These polypoid t umours contained small amounts of melanin and only focal areas of epit helioid 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 tumou rs are widely infiltrative, and there is no evidence to suggest that t hey will behave any differently from conventional, non-botryoid, non-m yxoid sine-nasal melanomas.