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  • Title: A case of lichen planus-like keratosis: deposition of IgM in the basement membrane zone.
    Author: Inui S, Itami S, Kobayashi T, Yoshikawa K.
    Journal: J Dermatol; 2000 Sep; 27(9):615-7. PubMed ID: 11052240.
    Abstract:
    An 81-year-old woman presented with a round erythematous macule with keratotic scales on her left hand. The skin specimen histologically showed hypergranulosis and apoptotic keratinocytes in the epidermis with lichenoid infiltration of lymphocytes. Parakeratosis seen in the hyperkeratotic cornified layer indicated lichen planus-like keratosis, as distinguished from lichen planus. Direct immunofluorescence study revealed the linear deposition of IgM in the basement membrane zone; IgG, IgA and C3 were not detected.
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