Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is new small left pleural effusion and left lung base collapse . Cardiomediastinal silhouette is normal size . ET tube terminates 4 cm above the carina . Transesophageal tube courses below the diaphragm and out of view . Mediastinal drain is in unchanged position .
    OUTPUT:
    
There is new small left pleural effusion and left lung base collapse , possibly secondary to mucous plugging .