Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest radiographs are obtained . Heart is normal size and cardiomediastinal contours are unchanged . Drainage catheter noted within the upper abdomen . Right PICC is stable . Increased opacification of the left base is consistent with atelectasis and small pleural effusion , although an superimposed consolidation can not be exluded . No interval changes in the right lung . Small right pleural effusion . No pneumothorax .
    OUTPUT:
    
Worsening opacification within the left base , likely a combination of pleural effusion and atelectasis but in the appropriate clinical context pneumonia can not be excluded .