Investigations
Chest X-ray showed cardiomegaly with abnormal contour of left heart (Figure 2). Given history of chest trauma, a transthoracic echocardiogram (TTE) was performed which revealed a large echolucent structure lateral to the left heart (Figure 3A-C, Video). Contrast echocardiography showed that structure was contiguous with the left atrium (LA) [Figure 3C].