Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is normal . A right - sided aortic arch is again seen . The hilar and mediastinal contours are within normal limits . A left basilar linear opacity persists over multiple prior radiographic studies , appearing more prominent today , likely reflecting increased atelectasis . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Left basilar atelectasis , though chronic , has increased since ___ ; PE can be considered on the differential . The findings were discussed by Dr . ___ with Dr . ___ ___ telephone at 13 : 23 on ___ .