Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Right lower lobe opacity may represent atelectasis or pneumonia . There is no effusion or pneumothorax . Subsegmental atelectasis at the left base is seen . There is moderate cardiomegaly . The mediastinal silhouette is normal . Imaged osseous structures are intact . No free air below the right hemidiaphragm is seen . Aortic calcifications are mild .
    OUTPUT:
    
Right lower lobe opacity may represent atelectasis or pneumonia . Cardiomegaly .