Fig. 2
From: Right pneumothorax with congenital pericardial defect showed right atrium mimicking bulla in surgery
During surgery, the right atrium (RA) seemed as if it had been a non-pedunculated bulla or pericardiac cyst (A). When the lungs were moved, heart beat was observed without respiratory motion (B). Continuity to the heart was observed (C). Heart beating, continuity with the heart, and the absence of respiratory motion could distinguish the right atrium from a bulla, and a pericardial defect was confirmed