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Fig. 3 —45-year-old woman with S-shaped sinoatrial node artery
(short black arrows, C) arising from right coronary artery
(RCA).
A-C, Axial CT images at level of left atrial appendage (LAA)
(A) and coronary sinus (B) and 3D posterior CT scan (C)
of heart show rare variant found in one patient. S-shaped sinoatrial node
artery originates from terminal branches of dominant right coronary artery
posterior to coronary sinus (CS) (B and C) and courses along
posterolateral wall of left atrium toward groove between LAA and left superior
pulmonary vein (LSPV). IVC = inferior vena cava, LIPV = left inferior
pulmonary vein, PLA = posterolateral artery (long black arrows,
C), RA = right atrium. White arrows indicate areas of A and
B that correspond to C.
