Evaluation of anomalous right coronary artery originating from the left sinus of valsalva with 320-row coronary CT angiography

LIANG Yi; FAN Na; WANG Hanlin; DU Bolin

Abstract：Objective To evaluate the value of 320-row coronary CT angiography in the diagnosis of anomalous right coronary artery (ARCA) originating from the left sinus of valsalva.Methods Eight patients who underwent 320-row coronary CT angiography for an ARCA originating from the left sinus of valsalva were included in this study.The other eight patients with normal origin of RCA were included as the control group.All cases were used MPR,MIP and VR images to display the origin,opening orifice and course of RCA.The diameter of proximal segment of RCA during systole and diastole,and the angle between the right anterior wall of ascending aorta and proximal segment of RCA were measured.Systolic stenosis rate of the proximal RCA was calculated.In these two groups,ages,radiation dose,the diameter changes of the proximal RCA,and the angle between ascending aorta and RCA were compared with independent sample t test.Results 8 cases of ARCA originating from the left sinus of valsalva by VR and thin MIP were identified.VR display variation was the most intuitive.There was no significant difference of age and radiation dose between two groups (P ＞ 0.05).The diameter of proximal segment of RCA during systole and diastole was (2.1± 0.3) mm,(2.6 ± 0.7) mm,angle between ascending aorta and RCA was (18.4° ± 1.4°),compared with the control group [systole (4.7 ± 0.7) mm,diastole (4.9 ± 0.6) mm,angle (60.7° ± 9.4 °)] were reduced obviously (P ＜ 0.05).Conclusion 320-row coronary CT angiography can visualize anomalous origin and course of the RCA,and dynamically evaluate diameter changes of proximal RCA in the cardiac cycle,providing useful clues to identify the cause of myocardial ischemia.