Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: No pneumothorax detected . Probable background COPD . Surgical clip noted in right upper zone at the site of a right upper lobe nodule , much better depicted on the previous CT scan . Left upper lobe ground - glass nodule seen on CT is not readily apparent radiographically . There is probable mild cardiomegaly . No CHF , focal infiltrate or gross effusion . Minimal atelectasis the cardiophrenic region noted . Incidental note made of presumed bone island in the left inferior glenoid .
    OUTPUT:
    
No pneumothorax detected .