Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest demonstrate normal lung volumes . Right lung base opacities are new since prior exam . There is no pleural effusion or pneumothorax . Hilar and mediastinal silhouettes are unchanged . The heart is top normal . There is no pulmonary edema . Lateral view demonstrates patient 's known left humeral fracture , further assessed on ___ dedicated humeral radiographs .
    OUTPUT:
    
Right lung base opacity is new since ___ exam and may represent atelectasis , aspiration or infection in the appropriate clinical setting .