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Skin - Nonmelanocytic tumors

Adnexal tumors-hair follicles

Warty dyskeratoma

Reviewer: Christopher Hale, M.D. (see Reviewers page)
Revised: 5 July 2012, last major update June 2012
Copyright: (c) 2001-2012, PathologyOutlines.com, Inc.

General
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● Also called isolated follicular keratosis
● Small maculopapular lesion of sun-exposed skin of head/neck
● Either follicular counterpart of actinic keratosis or a follicular neoplasm
● Not related to Darier’s disease

Case reports
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● 47 year old man with scalp nodule (Ann Dermatol 2011;23:98)

Clinical images
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A solitary, well-defined, erythematous, hairless nodule with a hyperkeratotic plug on the left parietal scalp

Gross description
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● Solitary, well-defined nodule

Micro description
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● Cup-shaped keratin-filled invagination
● Acanthotic epidermis with acantholytic dyskeratotic cells
● Suprabasilar clefting with villi projecting into clefts

Micro images
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Warty dyskeratoma

Differential diagnosis
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● Darier disease
● Grover disease
● Acantholytic squamous cell carcinoma
● Basal cell carcinoma
● Actinic keratosis

End of Skin - Nonmelanocytic tumors > Adnexal tumors-hair follicles > Warty dyskeratoma

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