Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared with prior radiographs on ___ , there is increased opacity at the left lung base , likely representing atelectasis or aspiration . Right - sided basilar atelectasis and effusion are unchanged . Cardiomediastinal silhouette is unchanged . There is no pneumothorax . Left Port - A - Cath and right - sided PICC line are unchanged in appearance .
    OUTPUT:
    
Increased left basilar atelectasis or aspiration .