[A clinical case of primary malignant melanoma of the oral cavity].

A rare case of primary malignant melanoma of the oral cavity is reported and a literature review of etiopathogenesis, biological bases and prognosis is made. The hypotheses to explain the very severe prognosis of malignant melanoma of the oral cavity with respect to that of skin are discussed. The therapeutic approaches are described as well as the frequent difficulty to perform them in relation to the anatomical region and the wide extension of the tumoral lesion.