The use of arteriography in the evaluation of myocardial implants and coronary arteries is increasing. Transbrachial selective catheterization of the internal thoracic (mammary) artery (4), first described by Arner (1), has been used to evaluate internal thoracic arterial implants in the myocardium (2, 3). Odman (6) demonstrated that percutaneous catheterization of the main branches of the aorta is feasible, and recently Judkins (5) reported this modification of Seldinger's technic (7) for transfemoral coronary arteriography. This paper presents a method of selectively catheterizing both internal thoracic arteries and the coronary arteries at one examination, using the transfemoral Seldinger technic. This procedure was developed for a number of reasons: (a) the need for arteriographic evaluation of bilateral internal thoracic arterial implantation in the myocardium; (b) the difficulty in using the left brachial retrograde approach for left internal thoracic arteriography following arteriographic or local ...