Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A tracheostomy is in - situ , unchanged in position compared to the prior study . Lung volumes are slightly low but unchanged compared to the prior study . There is a developing opacity at the right lung base , likely within the right middle lobe . This may be due to atelectasis however infection can not be excluded . No pleural effusion or pneumothorax seen . Incidental note is made of an azygos fissure .
    OUTPUT:
    
Interval development of an airspace opacity at the right lung base suspicious for right middle lobe consolidation versus atelectasis .