Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Normal cardiomediastinal and hilar contours . Stable , biapical pleural scarring . No pneumothorax or pleural effusion . Ill - defined opacity at the right base on the frontal view without a correlate on the lateral view could represent sequela of recent pneumonia .
    OUTPUT:
    
Ill - defined , right basilar opacity seen on the frontal view only could represent a sequela of recent pneumonia .