Acute Mitral Regurgitation Presenting with Right Upper Lobe Opacification

We describe a rare entity in which acute mitral regurgitation causes asymmetric findings on chest radiograph. The patient presented with rapid-onset respiratory failure from flash pulmonary edema. She had unilateral infiltrates on chest radiograph, which evoked infectious etiology. However, we identified a flail mitral valve leaflet, for which the patient received an emergent mitral valve replacement. Fortunately, she made a full recovery. We discuss the mechanism of the asymmetric chest radiograph findings, which we were able to confirm using a transesophageal echocardiogram