PA film of a patient with a large pericardial effusion. Note the abnormal (>0.5) cardiothoracic ratio and classic “globular” shape to the heart. Other features of pericardial effusion (not seen) include a loss of the indentations on the left mediastinal border and, on the lateral film, separation of the peri- and epicardial fat pads.
Pericardial Effusion No. 1