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Images 10.42.1A: Perivascular dermatitis, interface, vacuolar + 10.42.1B: Lymphocytes along the dermoepidermal junction, slight spongiosis, and necrotic keratocytes in a thin epidermis = Graft-versus-host disease Sometimes it is difficult to differentiate graft-versus-host disease from erythema multiforme on grounds histopathologic alone, but the distinction can be made, as in this instance, by noting a thinned epidermis, […]