Figure 1
(A) Right dominance. (B) Codominance. (C) Left dominance. CxA, circumflex artery; PIA, posterior interventricular artery; RCA, right coronary artery
Figure 2
(A) Two orifices in the right cusp. (B) Three orifices in the right cusp. Extra orifice (arrow) aside from RCA (open arrow) was conal artery. RCA, right coronary artery
Table 1
Anatomic variations of coronary arteries, n (%)
| Dominant pattern (n = 95) | |
| Right | 88 (93) |
| Left | 5 (5) |
| Codominance | 2 (2) |
| Coronary orifices (n = 95) | |
| Dual aortic origin | 65 (68) |
| One orifice in the left and 2 orifices in the right aortic cusps | 28 (29) |
| One orifice in the left and 3 orifices in the right aortic cusps | 1 (1) |
| Two orifices in the left aortic cusp | 1 (1) |
| Branching pattern of LCA (n = 93) | |
| Bifurcation | 32 (34) |
| Trifurcation | 53 (57) |
| Quadrifurcation | 8 (9) |
| Conal artery (n = 95) | |
| One branch | 31 (33) |
| With a separate orifice | 7 (7) |
| From RCA | 24 (25) |
| Two branches | 53 (56) |
| Two with separate orifices | 1 (1) |
| One separate orifice and one RCA | 17 (18) |
| From RCA | 35 (37) |
| Three branches | 11 (12) |
| One separate orifice and 2 RCAs | 4 (4) |
| From RCA | 7 (7) |
| RPDA (n = 95) | |
| Absence | 52 (55) |
| From RCA | 43 (45) |
[i] LCA, left coronary artery; RCA, right coronary artery; RPDA, right posterior diagonal artery
Figure 3
(A) One conal artery from the aorta. (B) Two conal arteries, one from aorta (1) and another from RCA (2). (C) Three conal arteries, one from aorta (2), 2 from RCA (1, 3). RCA, right coronary artery
Figure 4
(A) RPDA branched from RCA at acute margin; (B) RPDA branched from RCA after giving the marginal artery. RCA, right coronary artery; RPDA, right posterior diagonal artery
Figure 5
(A) Two orifices in the left aortic cusp: RCA (1) and LCA (2). (B) Interatrial course of RCA between PT and aorta. LCA, left coronary artery; PT, pulmonary trunk; RCA, right coronary artery
Table 2
Prevalence of coronary artery anomalies, n (%)
| Anomalous origin of RCA | |
| RCA from the left aortic cusp | 1 (1) |
| Myocardial bridge | |
| One site | 42 (44) |
| AIA | 3 |
| RPDA | 2 |
| PIA | 2 |
| LMA | 1 |
| Two sites | 11 (12) |
| AIA/AIA | 5 |
| AIA/DA | 1 |
| AIA/MA | 1 |
| AIA/RPDA | 1 |
| PIA/DA | 1 |
| PIA/MA | 1 |
| PIA/LMA | 1 |
| Three sites | 5 (5) |
| AIA/AIA/RPDA | 1 |
| AIA/DA/PIA | 1 |
| AIA/AIA/MA | 1 |
| AIA/AIA/PIA | 1 |
| AIA/AIA/RCA | 1 |
| Four sites | 1 (1) |
| AIA/AIA/AIA/LMA | 1 |
[i] AIA, anterior interventricular artery; LMA, left marginal artery; DA, diagonal artery, MA, median artery; PIA, posterior interventricular artery; RCA, right coronary artery; RPDA, right posterior diagonal artery
Figure 6
(A) Myocardial loop. (B) Left dominant pattern in this case. CxA, circumflex artery; PIA, posterior interventricular artery; RCA, right coronary artery
Figure 7
(A) One site of the myocardial bridge on the AIA. (B) Two sites on the AIA. AIA, anterior interventricular artery