Figure 1 (A) Poroma: multiple epidermal attachments with downgrowth into the dermis. (B) Porocarcinoma, with clear cell change. (C) Higher power of porocarcinoma demonstrating cellular atypia, tumour necrosis, infiltration and budding into adjacent desmoplastic stroma. (D) In situ component adjacent to the invasive porocarcinoma depicted in (B) and (C).