[Primary malignant melanoma of the bladder. Apropos of a case]

The authors report about a case of a primitive melanoma of the bladder that a man aged 77 years suffered of. The diagnosis was carried-out with certain difficulty on fragments of endoscopic resection and was discussed from the clinical facts as well as from the anatomo-pathological results and, more particularly, from the immuno-histochemical results. This study makes it possible that a comparison be made with those rare cases observed on a world-scale basis which are described in the literature. As far as the bladder is concerned, it constitutes also an attempt of histogenetic explanation of this kind of tumor.