Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Allowing for slight underpenetration of current study , frontal lateral views of the chest demonstrate no definite evidence of pneumonia . There is no pneumothorax , vascular congestion , or pleural effusion . Mildly prominent cardiac silhouette is stable . Mediastinal contours are normal .
    OUTPUT:
    
No evidence of pneumonia .