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FIGURE 3. Patient with normal coronary morphology, as visualized by 64-slice MDCT. (A) Axial CT image was obtained at level of left main (LM) coronary artery ostium, which arises from left sinus of Valsalva and runs posterior to pulmonary artery (PA). LM coronary artery ostium divides into left anterior descending (LAD) and left circumflex (LCX) coronary arteries. A = aorta; LA = left atrium. (B) Axial CT image was obtained through origin of right coronary artery (RCA) at right aortic sinus and running between right ventricular outflow tract and right atrium (RA). Middle and distal segments of LAD coronary artery are located in interventricular groove. LCX coronary artery runs in left atrioventricular groove. (C) Cross-sectional view across midheart plane reveals middle RCA between RA and right ventricle (RV) and middle LAD coronary artery between RV and left ventricle (LV). (D) View of inferior aspect of heart shows posterior descending artery (PDA) arising from RCA running in posterior intraventricular groove.
