Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest radiographs were obtained . The lungs are well inflated and clear . No consolidation , nodule , effusion , or pneumothorax is present . The cardiac and mediastinal contours are normal . Linear lucencies projecting over the left pulmonary artery on frontal and lateral image correspond to previously diagnosed pneumomediastinum .
    OUTPUT:
    
Irregular lucency surrounding the left pulmonary artery consistent with trace pneumomediastinum .