Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable single frontal chest radiograph was obtained with the patient in a semi upright position . The position of the endotracheal tube and other monitor and support devices are unchanged . There is left lower lobe collapse with resulting loss of volume and shifting of the mediastinum to the left . No focal consolidation , pleural effusion , or pneumothorax is seen . Heart size is normal . The mediastinal contours are normal .
    OUTPUT:
    
Left lower lobe collapse and loss of volume , likely result of mucus plugging . Findings were communicated with Dr .___ by Dr .___ ___ telephone at 10 : 21 am on ___ at time of observation .