Histopathologic and Dermoscopic Characteristics of Mechanic’s Hands Associated with Dermatomyositis

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  • Mechanic’s handsの組織像およびダーモスコピー像に特異な所見を認めた皮膚筋炎の1例
  • Mechanic's hands ノ ソシキゾウ オヨビ ダーモスコピーゾウ ニ トクイ ナ ショケン オ ミトメタ ヒフ キンエン ノ 1レイ

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Abstract

A 67-year-old woman was referred to us with symmetrically distributed keratotic eruptions on the ulnar aspects of her thumbs and the radial aspects of her index and middle fingers. Histopathologically, we observed parakeratosis, loss of granular layer and liquefaction degeneration of basal layer around the top of the papillary dermis; in contrast, compact orthokeratosis and intact dermo-epidermal junction were observed at the epidermis above the crista profunda limitans. There were vertical columns of parakeratosis and orthokeratosis arranged in an alternate arrangement pattern. Dermoscopy showed a whitish, lace-like, double-line pattern along each side of the furrows. This dermoscopic pattern seems to correspond histopathologically to the regular distribution of parakeratosis above the papillary dermis and compact orthkeratosis above the crista profunda limitans. Although a clinical differential diagnosis of mechanic’s hands from other dermatoses may be difficult, dermoscopy may be a useful tool for distinguishing them.

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