Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Previously seen left lower lobe subsegmental atelectasis has resolved in the interval . No recurrent large hiatal hernia is evident on this radiographic examination . Lungs are clear . Mediastinal and hilar contours are within normal limits . There is no pneumothorax .
    OUTPUT:
    
Improved aeration of the left lung base . No evidence of recurrent hiatal hernia .