[Melanocytic schwannoma: a rare tumor originating in the neural crest. Apropos a case associated with Horner's syndrome].

Schwann cells tumors, producing melanin, are extremely rare and pose difficult problems for its differential diagnoses from melanomas, which are tumors with different prognostic and treatment. In this paper a new case is described, which debuts as Claude-Bernard-Horner syndrome being diagnosed with the help of Immunohistochemistry and Electronic Microscopy.