Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The left apical pneumothorax is stable . There is a mild improvement in interstitial edema in the left middle and lower lung . Heart size is top normal . There is no pleural effusion .
    OUTPUT:
    
Stable left apical pneumothorax . Findings were discussed with Dr . ___ by phone at 4 :46 p .m .