[Ultrastructural study of the Dego's disease (report of a new case and literature review) (author's transl)].

An observation of a new case of Degos' disease in a 42 year old woman presenting a merely cutaneous symptomatology, enabled to perform a detailed ultrastructural study of vascular lesions, nerves, infiltrate and perivascular fibroblasts. The episodic clinical evolution with various formation periods of vascular lesions, the frequency of virus-like inclusions in the endothelial cells and fibroblasts, as well as C3 deposits and the presence of intracytoplasmic cylinders in the histiocytes, suggest a common physiopathologic mechanism with the autoimmune diseases. A bibliographic review accompanies the clinico-pathological study.