Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is at the upper limits of normal size . The mediastinal and hilar contours appear unremarkable . There is no pleural effusion or pneumothorax . The lungs appear clear . A mild compression deformity of L1 appears unchanged allowing for differences in technique . However , healed left posterolateral rib fractures involving the sixth and seventh ribs and possibly the eighth are unchanged . A right anterolateral seventh rib fracture shows callus suggesting that it is also subacute or older .
    OUTPUT:
    
No findings suggesting recent injury or acute cardiopulmonary disease .