PMC5587925_01
Computer tomography: two consecutive coronal reformatted (a and b) and axial images (c) show stump of the superior vena cava (long arrow), bridging vein (short arrows), and persistent left superior vena cava (star).
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fig1
The PLSVC drained into the right atrium via a dilated CS (Figure 1). 
Chest X-ray showing final position of pacemaker and leads.
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fig2
A chest X-ray obtained after procedure showed satisfactory lead positioning and no pneumothorax (Figure 2).