**5.3.6 Absent proximal ectopic course (type F)**

As mentioned above, a single coronary artery is never associated with an abnormal proximal course. The myocardium usually dependant on the absent coronary artery is fed by a retrograde flow using a coronary network, near normal. Besides, a coronary artery, connected with the contralateral artery far from the proximal segment of the latter, may have normal relationships with the cardiac structures.

#### **5.3.7 Other ectopic courses (type G)**

Rare ANOCOR, such as abnormal origin from the aortic arch, may have another ectopic course, often complex, in contact with several structures. A LMCA with an anomalous connection with the pulmonary trunk courses usually facing the left side of the latter.
