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Histopathological findings of crater form of infundibular SCC. The lesion has a crateriform KA-like configuration with a central low keratin-filled ulcer (a). The tumor shows neoplastic aggregates of SCC expanding from a follicular infundibulum (b) and neoplastic cells invade deeply into the dermis (a,c). The features of KA or features of bowenoid dysplasia (solar keratosis or Bowen’s disease) are absent in the interfollicular epidermis (a).
