Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Endotracheal tube has again migrated upward with distal chamber terminating at the level of the carina . The more proximal chamber appears to end at the level of the clavicles . Linear lucencies identifed along the upper mediastinum as well as the right heart border suggests pneumomediastinum . Please correlate with recent instrumentation . Faint multifocal opacifications evident in the left lower lung and aerated portions of the right middle lung may represent edema versus hemorrhage . Small right pleural effusion is unchanged . Stable right lower lung colapse in a patient with preferential intubation of left lung . Improved aeration of the left lower lung .
    OUTPUT:
    
Upward migration of dual - chamber endotracheal tube with distal port in the trachea . Findings suggestive of pneumomediastinum . Correlate with recent surgical intervention . Improved aeration of the left lung . Dr ___ discussed these findings with Dr ___ at 15 :30 on ___ via telephone who confirms bronchcoscopy prior to chest radiograph .