Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest are obtained . There is left lower lobe collapse , causing mild leftward mediastinal shift . In the setting of asthma one can assume initially that the cause is mucus plugging of central bronchi . If this does not clear with treatment , inspection or imaging of the bronchial tree would be justfied . The lungs are otherwise clear and the heart is normal size . There is no pleural effusion , pulmonary edema , or pneumothorax .
    OUTPUT:
    
Left lower lobe collapse probably due to asthmatic mucus plugging . Suggest repeat chest radiograph after two weeks ' treatment to document resolution . The above findings were communicated to Dr . ___ by Dr . ___ ___ pager at 11 :00 , five minutes after discovery was made and were subsequently discussed over the telephone .