[Primary mucous melanoma of the nasal cavity: a case report].

Mucous melanoma in the nasal cavity are unusual tumours that develop from common melanocytes pre-existent in the respiratory epithelium. They manifest a high diagnostic and therapeutic difficulties as well as an obscure prognosis. A case of this rare tumour is exposed and a bibliographic review in which clinical, diagnostic, histological, therapeutic and prognostic features are contemplated.