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].