Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Since prior , there has been resolution of a left hydropneumothorax . There is no focal lung consolidation . The heart is stably mildly enlarged . Mediastinal contours unchanged . There is linear atelectasis at the right lung base . Degenerative changes are noted within the thoracic spine .
    OUTPUT:
    
Resolution of left hydropneumothorax . Postsurgical changes from left lower lobectomy . .