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In dogs, autoimmune subepidermal blistering diseases (AISBDs) encompass several distinct entities that exhibit varying clinical signs, microscopic characteristics, prognosis, and response to treatment. The identification of targeted autoantigens is usually required to make the diagnosis, but immunological tests to determine these antigens are not commercially available. Epidermolysis bullosa acquisita (EBA) is an AISBD characterized by the production of autoantibodies against collagen VII in sublamina densa anchoring fibrils. This article reports on the usefulness of collagen IV immunostaining on paraffin-embedded skin biopsies as an aid to diagnose EBA in dogs. In this disease, collagen IV, which forms the fibrous 2-dimensional network of lamina densa, is detected more commonly above subepidermal vesicles than below. In other canine AISBDs, this is rarely the case. Collagen IV immunostaining therefore offers an inexpensive means to help making a suggestive diagnosis of EBA in the absence of serological determination of the targeted autoantigen.

Usefulness of Collagen IV Immunostaining for Diagnosis of Canine Epidermolysis Bullosa Acquisita