Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP upright and lateral views of the chest provided . Mildly elevated right hemidiaphragm with right basal atelectasis is new in the interval . There is a retrocardiac opacity likely representing a hiatal hernia . Left lung is clear . No large effusion or pneumothorax . Cardiomediastinal silhouette appears stable . No acute bony injury .
    OUTPUT:
    
Right basal atelectasis with elevated right hemidiaphragm . Retrocardiac opacity may represent a hiatal hernia .