Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette is enlarged but stable in size . Pulmonary vascularity is within normal limits . Focal patchy opacity is present in the left retrocardiac region with otherwise clear lungs . No pleural effusion . Scoliosis is noted .
    OUTPUT:
    
1 . Cardiomegaly without evidence of congestive heart failure . 2 . Patchy left lower lobe opacity , which may reflect patchy atelectasis , focal aspiration , and less likely an early infectious pneumonia . Followup radiographs would be helpful to assess for resolution .