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The lordotic right posterior oblique projection of the left coronary artery is obtained by combining cranial angulation of the X-ray beam with rotation of the patient into the right posterior oblique position. This projection is helpful for separation of the main left coronary artery and the proximal portions of the left anterior descending and circumflex divisions, especially in patients in whom the left anterior descending artery is directed cephalad early in its course. The obtaining of an image from the lordotic right posterior oblique projection adds less than two minutes to the procedure and improves arteriographic assessment of the left coronary artery.

Lordotic right posterior oblique projection of the left coronary artery: a speical view for special anatomy.