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Lichenoid Nail Unit Changes in an Elderly Patient: Answer.

MICROSCOPIC FINDINGS AND CLINICAL COURSE Histopathologic examination of hematoxylin-eosin– stained slides revealed nail matrix epithelium and overlying nail plate. The basal layer demonstrated single cell crowding by nonpigmented atypical cells with enlarged and hyperchromatic nuclei. These atypical cells were highlighted by Sox-10 immunostain (Fig. 4). Fibrovascular change was present in the superficial to mid-dermis.