Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single AP image was reviewed . The cardiomediastinal and hilar contours are normal . There is no pleural effusion or pneumothorax . Lungs are well expanded and clear . Pulmonary vasculature is within normal limits . The gas collection projecting over the upper esophagus , present since ___ is either a Zenkers diverticulum or distension of the upper esophagus ; contrast esophagram should be considered to see if this is clinically significant .
    OUTPUT:
    
No acute cardiopulmonary process . Either chronic Zenkers diverticulum or distension of the upper esophagus couild be further evaluated with contrast esophagram . Conventional chest radiographs are not adequate to evaluate the chest cage . If there are focal findings of clinically significant trauma , they should be marked , and detail views should be requested .