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Figure 2 (A) Variant 1. Left = volume-rendered reconstruction. The CS, PIV, and small cardiac vein (SCV) are continuous at the crux cordis. The SCV (lower yellow arrow) runs in close association with the right coronary artery (RCA) (purple arrow). Right = the CS and SCV (yellow arrows) and RCA (purple arrow) on the transverse plane. (B) Variant 2. The CS enters the RA independently from the anterior cardiac veins. Right = the ostia of the CS, PIV, and PVLV are confluent and form a large common ostium (arrow). (C) Variant 3. Left = the PIV is not connected to the CS, but enters the RA independently, as is also demonstrated on the transversal orthogonal plane in the right panel. The purple arrows indicate the PIV and a right marginal vein (RMV); the yellow arrow indicates the CS. (D) This MSCT scan is of a patient who, besides the PIV, lacks CS tributaries. Although the ostium is rather large, more distal from the ostium, the CS narrows, as demonstrated on a volume-rendered reconstruction (left panel) and on a curved multiplanar reformatting (right panel). Abbreviations as in Figure 1.
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