Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . The mediastinal and hilar contours are grossly normal . The pulmonary vasculature is normal . A heterogeneous area of large opacification predominantly in the right lower lobe contains small , round interior lucencies . No pleural effusion or pneumothorax .
    OUTPUT:
    
Large right lower lobe pneumonia , possibly cavitary . If there is reason to suspect bronchial obstruction , CT scanning should be obtained now . Otherwise even if the patient 's clinical condition continues to improve repeat chest radiograph should be obtained in ___ weeks to document complete clearing and the absence of atelectasis or a discernible hilar mass .