Transient acantholytic dermatosis with involvement of oral mucosa.

Histologic, immunologic and electron microscopic studies were performed in a patient with transient acantholytic dermatosis which involved oral mucosa. Hitologic and electron microscopic findings were almost identical in both cutaneous and mucous membrane lesions, and these were similar to pemphigus vulgaris; suprabasilar separation with acantholytic cells. Desmosome-desmosome complexes were separated without disruption of cell membranes and cytoplasmic structures were well-preserved without dyskeratosis. Lamina lucida, however, was often separated in mucous membrane lesions, in contrast to the normal lamina lucida in cutaneous lesions of such cases or in pemphigus vulgaris. Direct and indirect immunofluorescence studies for pemphigus were repeatedly negative. This study shows that transient acantholytic dermatosis may involve mucous membrane and may resemble pemphigus vulgaris histologically and ultrastructurally except for the widened lamina lucida of the mucous membrane.