Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest radiographs demonstrate complete collapse of the left lung with hyperexpansion of the right lung and marked shift of the mediastinum and trachea to the left . There is no pneumothorax . No pleural effusion is visualized .
    OUTPUT:
    
Left lung collapse , highly suspicious for an obstructive mass . Further evaluation with CT chest or bronchoscopy is recommended . The results of this study were identified at 11 :04 a .m . and relayed to Dr . ___ by Dr . ___ by phone at 11 :09 a .m . on ___ .