Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest . There is minimal left apical pneumothorax , improved from prior study . The left pleural effusion has resolved . There is minimal left lower base atelectasis . Abnormal contour of the mediastinum on the left likely represents the known mediastinal mass . The right lung is fully expanded and clear . There is no right pleural effusion . The heart size is normal .
    OUTPUT:
    
1 . Minimal left apical pneumothorax , improved from most recent study . 2 . Resolution of left pleural effusion . These findings were discussed with Dr . ___ at 11 :00 a .m . on ___ by telephone .