To define the collateral circulation pathways between coronary arteries, 101 coronarographies of patients who had at least one occlusion of a coronary artery (left-anterior descending artery, circumflex, right coronary) were analysed. We found 12 collateral pathways for the right coronary, 8 for the anterior descending artery, and 4 for the circumflex artery. These collateral circulation pathways have been mapped and compared to those of literature.