Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Upright portable view of the chest demonstrates low lung volumes , which accentuates bronchovascular markings . There is no pleural effusion , focal consolidation or pneumothorax . Hilar and mediastinal silhouettes are unremarkable . Heart size is normal . Evidence of free is is seen under the right hemidiaphragm , which may relate to patient 's reported recent cholecystectomy .
    OUTPUT:
    
Evidence of free air under the right hemidiaphragm , may relate to patient 's reported cholecystectomy earlier today .