Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a subtle patchy opacity at the left lung base on frontal view , possibly projecting over the spine on lateral view . This may represent pneumonia in the right clinical setting . There is no pleural effusion . Borderline cardiomegaly is unchanged . Cervical spine fixation device is unchanged .
    OUTPUT:
    
Possible left lung base pneumonia .