Coronary Angiogram

On the left, a coronary angiogram shows blockage of the right blood vessel of the heart (arrow). On the right, the blockage has been relieved after percutaneous transluminal coronary angioplasty.

(From AS Fauci, Harrison's Principles of Internal Medicine, 14 ed, 1998, McGraw-Hill, Fig. 245-1; with permission.)