Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette size appears mild to moderately enlarged with a somewhat globular configuration . Mediastinal contour is similar . The hila bilaterally are prominent , but this is unchanged from the previous examination . There is mild pulmonary vascular engorgement without frank pulmonary edema . Dense retrocardiac opacity is new from the prior study . No pleural effusion or pneumothorax is present . No acute osseous abnormalities seen .
    OUTPUT:
    
1 . Mild to moderate enlargement of the cardiac silhouette . While this could be due to cardiomyopathy , the somewhat globular configuration raises concern for a possible pericardial effusion and correlation with echocardiogram is suggested . 2 . Pulmonary vascular engorgement . 3 . Dense retrocardiac opacity concerning for pneumonia in the correct clinical setting .