Two cases of myasthenic syndrome with thymoma, polymyositis, myocarditis, and thyroiditis

A clinical and pathological study of 2 cases of a myasthenic syndrome in patients with an unusual combination of multiple visceral lesions (thymoma, polymyositis, myocarditis and thyroïditis) is reported. Histological study of these 2 cases emphazises that a myasthenic syndrome should be considered as the result of an auto-immune disease, but also that the thymus can be a target organ in the pathological process.