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October 1966

Keratinous Cysts of the Skin: Identification and Differentiation of Pilar Cysts From Epidermal Cysts

Author Affiliations


From the Division of Surgical Pathology, Department of Pathology, Washington University School of Medicine, Barnes and Barnard Free Skin and Cancer hospitals, Barnes Hospital Plaza, St. Louis.

Arch Dermatol. 1966;94(4):499-508. doi:10.1001/archderm.1966.01600280117019

The keratinous cysts, occurring predominantly on the scalp in man, wherein keratinization occurs in the absence of keratohyaline granules are derived from the piliary apparatus. Therefore, it is proposed they be called pilar cysts in contrast to the more generally distributed epidermal cyst wherein keratinization occurs with keratohyaline granules. Histological, histochemical, and ultrastructural observations on each type of cyst are presented.

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