Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Upright portable view of the chest demonstrates normal lung volumes . Right lung base opacities are more conspicuous since prior . There is no focal consolidation , pleural effusion or pneumothorax . Hilar and mediastinal silhouettes are unremarkable . Heart size is normal . A round opacity projecting over right lung seen on prior right hip radiographs earlier today is not visualized , and it was likely external to the patient . There is no pulmonary edema . Partially imaged upper abdomen is unremarkable .
    OUTPUT:
    
Right lung base opacities , may represent atelectasis , aspiration or infection in the appropriate clinical setting .