Abstract
Seven cases of Jadassohn''s nevus sebaceus of which three complicated by epithelioma baso-cellulare are described. All epitheliomas were observed in patients between 19 and 40 years of age. These observations gave the author an occasion to analyze the relationship between nevus sebaceus and their epitheliomas. From 160 cases of nevus sebaceus published in the world literature, including the author''s own observations, 34 were complicated by epithelioma, that is about 22%. This permits the author to consider Jadassohn''s nevus sebaceus as precancerous condition.

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