Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiographs demonstrate a normal mediastinal silhouette and well - aerated lungs without focal consolidation , pleural effusion , or pneumothorax . Pneumomediastinum is noted along the right infrahilar region as well as the aortic knob , and posterior to the heart on lateral view . Pneumopericardium is noted anteriorly . No intraperitoneal free air is seen . Retroperitoneal free air seen on CT from the same day is not appreciated on this exam .
    OUTPUT:
    
Pneumomediastinum and pneumopericardium , as partially seen on CT abdomen / pelvis from the same day . No focal consolidation .