(a)
(b)
(c)
Figure 2: Evolution of the patient’s chest radiographs. The prepericardiocentesis film (a) showed cardiomegaly secondary to the massive pericardial effusion. Five days after removal of fluid, new pockets of radiolucency were detected within the cardiac silhouette on both frontal (b) and lateral (c) projections, representing air within the pericardium (arrows pointing at outline of the sac).