Unusual coronary collateral circulation: filling of a totally occluded left anterior descending artery by direct continuity from a left posterior descending artery. A case report.

A patient with an unusual coronary collateral circulation is presented. The left anterior descending artery, which was totally occluded proximally, was filled directly by a continuation of the left posterior descending artery. A thallium stress test revealed normal perfusion in the territory of the left anterior descending artery.