Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest views were obtained with patient in upright position . Analysis is performed in direct comparison with the next preceding similar study of ___ . The previously identified remaining tiny left - sided apical pneumothorax can not be identified anymore . The pleural densities on the left base , however , remain with obliteration of the diaphragmatic contours and hazy densities related to the remaining pleural effusion that mostly occupies the posterior pleural sinus on the left side . The next previous examination detectable small air - fluid level related to the remaining postoperative pneumothorax is not seen anymore . The basal pleural densities along the diaphragm may have increased slightly , but no new parenchymal abnormalities are present . The right - sided hemithorax remains unchanged and within normal limits as before .
    OUTPUT:
    
Improved appearance of previously remaining small postoperative pneumothorax . Significant pleural densities on the left base remain in this patient status post left lower lobectomy . Further followup is recommended .