Table 1 Classification of anomalous coronary arteries (n=173)

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

- 1a. Course of anomalous LMS between aorta and RVOT (anterior)

13

- 1b. Course of anomalous LMS not between aorta and RVOT (posterior)

8

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

- 2a. Course of anomalous RCA between aorta and RVOT (anterior)

34

- 2b. Course of anomalous RCA not between aorta and RVOT (posterior

0

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

- 3a. Course of anomalous LCx between aorta and RVOT (anterior)

1

- 3b. Course of anomalous LCx not between aorta and RVOT (posterior)

33

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

- 4a. Course of anomalous LAD between aorta and RVOT (anterior)

4

- 4b. Course of anomalous LAD not between aorta and RVOT (posterior)

6

5. Single coronary artery (common origin)

- 5a. Course of anomalous coronary artery between aorta and RVOT (anterior)

13

- 5b. Course of anomalous coronary artery not between aorta and RVOT (posterior)

5

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

11

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

2

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

18

7. Miscellaneous / unclassified

25