Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single upright portable frontal radiograph of the chest demonstrates low lung volumes , with no evidence of pneumothorax , large pleural effusion , or overt pulmonary edema . Low lung volumes accentuate the bilateral pulmonary vasculature , with hazy opacity about the infrahilar right lung , possibly due to aspiration or infection . No acute osseous injury is detected . The heart size is mildly enlarged . Calcifications are noted in the aortic arch .
    OUTPUT:
    
Low lung volumes , with hazy opacity in the infrahilar right lung , possibly due to aspiration or infection can not be excluded in the appropriate clinical setting .