Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Chest PA and lateral radiograph demonstrates unremarkable mediastinal and hilar contours . The flattened contour of the AP window indicate possible pulmonary artery or lymph node enlargement . Heart size is top normal . Mild pulmonary vascular congestion . No pleural effusion or pneumothorax evident .
    OUTPUT:
    
Fullness in AP window due to enlarged main pulmonary artery or lymph node enlargement . Recommend comparison to prior studies . Mild vascular congestion .