Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Moderate - to - severe cardiomegaly is not associated with pleural effusions or pulmonary edema , but there is vascular engorgement . Some component of this may be due to aggressive fluid resuscitation . The patient has a right - sided dialysis catheter two lumens terminating in the IVC and right atrium respectively . There is a retrocardiac opacity concerning for pneumonia .
    OUTPUT:
    
1 . Retrocardiac opacity concerning for pneumonia . 2 . Enlargement of the cardiac silhouette either from cardiomegaly or pericardial effusion .