Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Opacity projects over the bilateral costophrenic angles due to overlying soft tissue . No definite focal consolidation is seen . There is no large pleural effusion or pneumothorax . The cardiac silhouette is mild to moderately enlarged . Mediastinal contours are unremarkable . While there may be some mild central pulmonary vascular engorgement no overt pulmonary edema is seen .
    OUTPUT:
    
Cardiomegaly ; underlying pericardial effusion not excluded . Possible mild central pulmonary vascular engorgement without overt pulmonary edema .