Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiographs demonstrate bilateral lung volumes with resultant bronchovascular crowding . Linear opacification projecting over the left lower lung likely represents atelectasis . Heart size is obscured by elevated left hemidiaphragm though appears grossly normal . Mediastinal and hilar contours are unremarkable . No pleural effusion or pneumothorax is present .
    OUTPUT:
    
No linear opacification projecting over left mid-lung is new and of unclear etiology , possibly representing bronchial occlusion ( asthma , mucoid plug ) or due to infarct . Could be further evaluated with CT with consideration given to patient 's renal status . ___ discussed with Dr ___ at 8 :00 AM on ___ via telephone at time of discovery .