Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Faint opacification at the lateral aspect of the lungs bilaterally is thought to represent underpenetration of soft tissues . The lungs are otherwise symmetrically well expanded and well aerated without focal airspace opacity , pleural effusion or pneumothorax . The pulmonary vasculature is not engorged . The cardiac silhouette is top normal in size . The mediastinal and hilar contours are slightly prominent related in part to tortuosity of the thoracic aorta . There is no evidence of pneumomediastinum . The trachea is midline . There is no free air beneath the right hemidiaphragm . No acute osseous abnormality is detected .
    OUTPUT:
    
No evidence of pneumomediastinum or free air beneath the right hemidiaphragm .