Pericardial effusions occur when excess fluid collects in the pericardial space. Normally pericardial sac contains approximately 30-50 mL of fluid. If the pericardial effusion becomes large enough, it can cause hemodynamic compromise, resulting in a cardiogenic shock state known as cardiac tamponade. Cardiac tamponade is a medical emergency that requires immediate treatment. Cardiac tamponade is a clinical diagnosis. CT findings can suggest this diagnosis.

This patient had both clinical and CT findings consistent with pericardial tamponade. Pericardiocentesis was performed and 500 mL of hemorrhagic fluid was drained.