Abstract
The Ota nevus or nevus fuscocaerulus ophtalmomaxillaris, recently named oculodermic melanocytosis, was described by the Japanese Ota in 1939. It consists of cutaneous hyperpigmentation in the territory of the first and second trigeminal branches, associated with ocular melanocytosis. This abnormal pigmentation is due to the aberrant migration of the cells of the neural crest, these cells being the embryological precursors of melanocytes. The sectoral form of the Ota nevi is rare.
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