Microscopic and ultrastructural study of the hair shaft: Significance and limits in diagnosis and of congenital hypotrichosis classification

The authors point out the most common hypotrichosis associated with structural alterations of the hair shaft. Suggested is a classification based on the typization of the most frequent ultrastructural defects. We emphasize the importance of microscopic and particularly ultrastructural findings of the hair shaft. The latter are very characteristic and useful for the diagnosis