Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is an approximately 4 - cm irregular central left hilar mass which is highly concerning for primary lung malignancy . It is associated with post-obstructive collapse of the lingula and partial collapse of the left upper lobe . Within the aerated portion of the left upper lung , there is a combined alveolar and interstitial pattern suggesting possible re-expansion edema or a post-obstructive pneumonia . Underlying component of lymphangitic spread is difficult to exclude . There is a small quantity of residual pleural effusion seen on the left side . The cardiomediastinal silhouette is shifted to the left .
    OUTPUT:
    
1 . Large central left hilar mass concerning for primary lung malignancy with postobstructive atelectasis . 2 . Re-expansion edema vs . post-obstructive pneumonia in the left upper lung region . 3 . Small residual left - sided effusion . 4 . No pneumothorax . These findings were Dr . ___ at 3 :05 PM via phone by ___ .