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Figure 5 Axial spin echo MRI demonstrating a sinus venosus defect (arrow) just caudal to the insertion of the superior vena cava and between the right atrium (RA) and left atrium (LA). Due to its location high in the atrium, it is sometimes difficult to cross with a catheter or to visualize with transesophageal echocardiography (TEE). This defect was misidentified on both catheterization and TEE examinations.
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