Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes have increased slightly . Streaky bibasilar density consistent with subsegmental atelectasis has improved . There is continued evidence of a small left effusion . Mediastinal structures are stable . A right internal jugular catheter remains in place .
    OUTPUT:
    
Interval improvement in subsegmental atelectasis . Evidence for left effusion unchanged .