Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest were reviewed . Linear lucencies bilaterally in the upper neck are indicative of pneumomediastinum . The heart size is normal . The mediastinal width is normal . The hilar are unremarkable . There is no pleural effusion or pneumothorax . The lungs are well expanded and clear .
    OUTPUT:
    
Pneumomediastinum with no other acute abnormalities .