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11.9.1A: Perivascular dermatosis, psoriasiform lichenoid + 11.9.1B: Preponderance of mononuclear (Langerhans”) cells with large pale nuclei and abundant amphophilic cytoplasm associated with a mix of inflammatory cells = Histiocytosis X (Letterer-Siwe disease) The diagnosis histopathologic depends on recognition of the distinctive abnormal Langerhans” cells. Numerous erythrocytes extravasated in the upper part of the dermis, and […]