Table 1 Classification of anomalous coronary arteries*

1. Origin of both RCA and LMS (separate origins) from the right aortic sinus

1a. Course of anomalous LMS between aorta and pulmonary artery (PA)

1b. Course of anomalous LMS not between aorta and PA

2. Origin of both coronary arteries (separate origins) from the left aortic sinus

2a. Course of anomalous RCA between aorta and PA

2b. Course of anomalous RCA not between aorta and PA

3. Anomalous origin of the circumflex coronary artery from the right aortic sinus

3a. Course of anomalous LCx between aorta and PA

3b. Course of anomalous LCx not between aorta and PA

4. Anomalous origin of the left anterior descending artery from the right aortic sinus

4a. Course of anomalous LAD between aorta and PA

4b. Course of anomalous LAD not between aorta and PA

5. Single coronary artery (common origin)

5a. Course of anomalous coronary artery between aorta and PA

5b. Course of anomalous coronary artery not between aorta and PA

6. Anomalous origin or communication of a coronary artery with a cardiac chamber or major thoracic vessel

6a. Abnormal origin from the pulmonary artery or one of its major arterial branches

6b. Abnormal origin from the aorta or one of its major arterial branches

6c. Abnormal communication of a coronary artery with a cardiac chamber or major thoracic vessel (fistula).

7. Miscellaneous/unclassified