In a material of 162 patients with different types of cardiomyopathy it was found that the standard chest radiograms could give important contributions to the diagnosis of the disease. The two main groups hypertrophic and other cardiomyopathy could in most instances be separated from each other. Nearly all patients had an abnormal chest radiogram when first studied. A positive roentgen diagnosis no standard chest examination supports a clinically suspected diagnosis of cardiomyopathy and should be possible in at least 80% of the patients. Angiocardiography can always provide the diagnosis in unclear cases and gives details of anatamy and function of the left and right ventricles in patients where surgical intervention of an intraventricular obstruction is contemplated.