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 comparison with the next preceding PA and lateral chest examination of ___ as well as special oblique chest views obtained of ___ . Furthermore comparison was extended to a chest CT examination of ___ . Position of previously described left - sided Port - A - Cath system is unchanged . Also unchanged appearance of the right - sided apical abnormalities apparently related to patient 's known small cell lung cancer with several cystic lucencies and more linear densities surrounding the area . On chest CT examination of ___ , a loculated left - sided pneumothorax was identified without causing any signs of tension or mediastinal shift . The small sized pneumothorax with maximal width of 2 cm occupied mostly the anterior pleural space as well as the mediastinal space of the pleura . Thus , the pneumothorax is difficult to identify on the standard PA and lateral chest views . The previously obtained oblique views raise the possibility of some pneumothorax extending into the left lateral basal pleural area . Throughout , left - sided lung remained well aerated without evidence of acute infiltrates . No evidence of pleural effusion . When comparison is made directly with the next preceding frontal view of the chest examination of ___ , the area of suspicious extension into the left lateral basal area is less marked , suggesting that the pneumothorax is decreasing .
    OUTPUT:
    
Loculated left - sided pneumothorax , mostly occupying mediastinal area of pleural space ( shown on CT ) , difficult to identify on routine PA and chest examination . The present examination suggests regression , thus no evidence of new abnormalities . Further followup is recommended related to patient 's symptomatology . Continuously well - aerated left lung does not call for placement of a chest tube at this time . Telephone contact with referring physician , ___ . ___ was established at 3 p .m . and again at 4 p .m .