Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiomediastinal contours are unchanged . Ill - defined Left perihilar opacity seen in the lateral view likely corresponds to a pneumonia . There is no pneumothorax or pleural effusion . The osseous structures are unremarkable
    OUTPUT:
    
Faint opacity projecting in the left perihilar region likely correspond to pneumonia followup is recommended after treatment