Postmyocardial infarction pericarditis (Dressler syndrome) in a 58-year-old woman who returned to the emergency department for chest pain 12 days after discharge following an acute MI. Short-axis 4-mm-thick minimum intensity projection (MinIP) image shows transmural hypoattenuation of the anterolateral, inferolateral, and inferior segments at the midcavity level, owing to recent proximal left circumflex coronary artery territory infarction (black arrows). A moderate-size pericardial effusion is depicted, with areas of pericardial enhancement (white arrows), consistent with pericarditis. The patient’s symptoms dramatically improved after initiation of anti-inflammatory medications.