A 40-year-old woman underwent an atrial septal defect closure 4 years before presentation. During the operation, juxtaposition of the atrial appendages was found simultaneously but no obvious communication was found between the appendages. She recently experienced desaturation on exercise, and the residual communication was found between the juxtaposed atrial appendages. The residual communication was closed from the right to the left atrium. Herein, we report the rare case of juxtaposition of the atrial appendages with residual communication between them after an atrial septal defect closure.
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