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Figure 4 (A) Pericardial thickening in constrictive pericarditis. Cardiac magnetic resonance imaging in a 69-year-old man who presented with idiopathic pericarditis. Note marked thickening of the pericardium over much of the right heart and extending over the anterior portion of the left ventricle (arrow). (B) Resolution of pericardial thickening in transient constrictive pericarditis. Follow-up imaging of the heart performed in the same patient two months later demonstrates normal thickness of the pericardium (arrow).