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What is Row of tombstone is seen in which skin disorder: and explain in detail?
Ans. A. Pemphigus vulgaris* Pemphigus vulgaris is characterized by following signs:1. Bulla spread sign2. Perilesional, and distant Nikolsky sign3. Tzanck smear: Acantholytic cell* Histopathology shows suprabasal blister with row of tomb stone appearance of basal cells.* Direct immunofluorescence from perilesional skin demonstrated intra epidermal IgG deposits' in a fishnet pattern.