Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest were obtained . Rounded retrocardiac density with air - fluid level is consistent with a large hiatal hernia , also seen on the prior study . There is mild adjacent atelectasis . No focal consolidation is seen . There is no pleural effusion . The cardiac silhouette is stable . The mediastinal contours are also stable with calcification of the aortic knob . Mid lung scarring is again noted . There is adjacent left base atelectasis . An additional small focus of opacity adjacent to the left heart border on the frontal view , not well seen on the lateral view may be due to atelectasis , although an early infectious process is not excluded in the appropriate clinical setting .
    OUTPUT:
    
Large hiatal hernia . There is adjacent left base atelectasis . An additional small focus of opacity adjacent to the left heart border on the frontal view , not well seen on the lateral view may be due to atelectasis , although an early infectious process is not excluded in the appropriate clinical setting .