Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are low in volume but clear . The cardiac silhouette is enlarged . The mediastinal silhouette is normal . The left hilar contour is enlarged possibly related to left atrial enlargement . No pleural effusion or pneumothorax is present .
    OUTPUT:
    
Cardiomegaly with possible left atrial enlargement . An echocardiogram may be obtained for further evaluation .