Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Slightly limited study due to underpenetration . Heart size is top - normal . Mediastinal contour is preserved . Central pulmonary vascular prominence without interstitial edema . Lungs are clear . The pleural surfaces are clear without effusion or pneumothorax .
    OUTPUT:
    
Mild pulmonary vascular prominence without interstitial edema . No pneumonia .