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An Unusual Keratotic Papular Eruption—Diagnosis
Arch Dermatol. 2008;144(3):405-410.
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Diagnosis: Keratosis lichenoides chronica.
MICROSCOPIC FINDINGS
Histopathologic features showed acanthosis of the epidermis and the infundibular portion of hair follicles in association with hyperkeratosis and focal parakeratosis and scattered apoptotic keratinocytes in the stratum spinosum. A lichenoid tissue reaction was noted at the dermoepidermal junction composed of lymphocytes, histiocytes, and very occasional plasma cells with numerous colloid bodies. The infiltrate occupied the papillary dermis and also extended into the reticular dermis in a perivascular distribution. No syringocentricity was noted. A striking feature was the presence of massive telangiectasias in the papillary dermis.
DISCUSSION
Keratosis lichenoides chronica has not always been a clearly defined entity in the literature. According to Marschalkó and Karpati,1 it is a very rare disorder first described by Kaposi, and some confusion remains regarding terminology. Kaposi thought the condition to be a variant of lichen planus and hence coined the term lichen ruber verrucosus et reticularis, whereas Nekam distinguished it from lichen ruber . . . [Full Text of this Article]
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