Peripheral arteriography was a simple and accurate means of establishing the correct diagnosis in about 90 per cent of 24 mass lesions of the extremities. Specifically, it qualified as the diagnostic procedure of choice when a patient presented with a palpable mass in an extremity, and there were neither clinical nor plain roentgenographic findings to suggest the diagnosis. In most cases the lesion could be identified as a tumor or not, and the tumors could almost always be correctly characterized as benign on malignant. There was no morbidity from the procedure.