[Meningeal melanocytoma: aggressive evolution of a benign tumor: about 2 cases].

Meningeal melanocytomas are rare pigmented tumors affecting the central nervous system and developing in the cerebrospinal leptomeninges. We report two cases of meningeal melanocytomas showing very marked disparity in their evolution: a very long-term development of meningocerebral lesion, with malignant transformation resulting in the death of the first patient after 32 years and intramedullary ectopic location with very fast massive meningeal diffusion in the second patient. These two cases show the uncertain evolutive profile of meningeal melanocytomas.