Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable frontal semiupright radiograph of the chest demonstrates interval removal of the right subclavian catheter . Calcified hilar and mediastinal lymph nodes and granulomas in the left lower lung are unchanged . There is increased opacification at the left lung base which could represent atelectasis versus pneumonia . Linear opacification of the right lung base consistent with atelectasis . Normal heart size . No pneumothorax . Small left pleural effusion .
    OUTPUT:
    
Increased as opacification the left lung base could represent atelectasis or pneumonia . If indicated , this could be further clarified by conventional chest radiograph with PA and lateral views at full inspiration .