Skin fragility and joint looseness in 2 dogs with Ehlers-Danlos-like

Abstract

Background: Ehlers‐Danlos syndrome comprises a group of rare inherited connective tissue diseases characterized by skin hyperextensibility, joint laxity, skin and vessel fragility, and poor wound healing.Objective: The purpose of this report was to describe the clinical, histologic, and ultrastructural findings in 2 dogs with collagenopathies consistent with Ehlers‐Danlos syndrome.Methods: Two dogs were examined clinically; skin extensibility index was calculated. Skin biopsies obtained from the dorsum were examined by light and electron microscopy.Results: Both dogs had clinical signs of skin hyperextensibility and fragility, lower skin elasticity, vessel fragility, and poor wound healing. One dog had a hip dislocation, and the other had bilateral medial patellar luxation (grade II), subcutaneous hematomas produced by minimal trauma, and generalized periodontitis. Histologic and ultrastructural examination confirmed abnormalities in the structure and arrangement of collagen fibrils. Fibroblasts were characterized by variable dilatation of the rough endoplasmic reticulum, and anomalous elastic fibers (elaunin fibers) were present in the dermis.Conclusion: Although the primary defects underlying collagenopathies in animals are still unknown, analysis of the ultrastructural changes in collagen fibrils and clinical findings could facilitate better characterization of these disorders in dogs.