Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Semi-upright portable AP view of the chest . There are bilateral opacities consistent with pulmonary alveolar edema . In the right lower lung , a more confluent opacity may represent pneumonia . Possible small right pleural effusion . Moderate cardiomegaly is stable . Sternotomy wires , mediastinal clips , and prosthetic valve are unchanged . No pneumothorax .
    OUTPUT:
    
Cardiomegaly and pulmonary edema . Possible superimposed right lower lobe pneumonia .