Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest demonstrate well - expanded and clear lungs . Heart is normal in size . Lucency surrounding the heart and the hilar structures is consistent with pneumomediastinum . There is also evidence of pulmonary interstitial emphysema . A small amount of air is also seen in the soft tissues of the neck . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
1 . Pneumomediastinum likely secondary to pulmonary interstitial emphysema which can be seen in the setting of asthma exacerbation . 2 . No evidence of pneumonia . Comment : Findings were emailed to the " ED QA Nurses " by Dr . ___ at 9 :45 am on ___ to be communicated directly with the patient 's primary care provider .