Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Again noted is a large hiatal hernia . The cardiac , mediastinal and hilar contours appear unchanged . Streaky opacifications in the left inferior hilar region were present before to some extent and can be expected as chronic atelectasis is often seen in association with a large hiatal hernia . However , it appears more prominent than before and the possibility of superimposed pneumonia could be considered . There is probably a trace pleural effusion on the left . A very small pleural effusion is difficult to exclude on the right .
    OUTPUT:
    
Increased left basilar opacity . The appearance and location are fairly typical for atelectasis that is usually seen in conjunction with a large hiatal hernia , although superimposed pneumonia is a possibility to consider .