Palmoplantar keratoderma of Sybert (also known as "Greither palmoplantar keratoderma," "Greither syndrome," "Keratosis extremitatum hereditaria progrediens," "Keratosis palmoplantaris transgrediens et progrediens" "Sybert keratoderma," and "Transgrediens and progrediens palmoplantar keratoderma") is an extremely rare autosomal dominant keratoderma (a skin condition involving horn-like growths) with symmetric severe involvement of the whole palmoplantar surface in a glove-and-stocking distribution.
It was characterized by Aloys Greither in 1952.
It was characterized by Virginia Sybert in 1988.
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