Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral radiographs of the chest demonstrate expanded lungs . Again seen is an area of rounded atelectasis in the retrocardiac region . A right pectoral port - a-cath is seen with the tip terminating in the mid SVC . There are no pleural effusions or pneumothorax .
    OUTPUT:
    
No evidence of pneumonia .