Abstract
TWO RECENT events emphasize the desirability of resurveying certain of the histologic appearances of Darier's disease (keratosis follicularis). The first is the recognition of familial benign chronic pemphigus and its separation from the concept of Darier's disease (by Hailey and Hailey, and others). The other is the following experience involving a number of competent pathologists, both dermatologic and general. In the course in pathology given by Weidman at the American Academy of Dermatology and Syphilology in Chicago in 1940, an "unknown" slide (3675) was included among those of the tumors as an example of Darier's disease, with pseudoepitheliomatous hyperplasia. When this slide was presented to the round table on pathology at the same meeting, those present stated the belief that the specimen represented nevus syringocystadenomatosus papilliferus. Since then, the specimen has gone the rounds, and considered diagnoses have varied from atypical squamous cell epithelioma, to a combination diagnosis,

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