Coronary artery stenosis cans be effectively treated by non-operative percutaneous transluminal coronary angioplasty(PTCA). We performed PTCA in three patients with coronary artery stenosis, who were referred to the departement of radiology, from January to December in 1985. The result were as follows : 1. The location of coronary artery stenosis were the proximal anterior descending branch of left coronary artery. 2. The number of stenotic lesions was single without calcium plaque in all three cases. 3. The extent of coronary artery disease is focal, under 2 cm in length. 4. PTCA was performed successfully with satisfactory post-dilatation results in all cases. 5. Severe complications such as arterial intimal dissection, acute myocardial infarction, did not occured. PTCA has many advantages over vascular surgery on surgical, economical , and psychological aspects.