Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Inspiratory lung volumes are lower compared to the previous exam . This results in crowding of bronchovascular structures which somewhat obscures assessment of the potential pulmonary nodules seen on the previous radiograph . Additionally , atelectasis within both lung bases appears worse in the interval . Cardiac and mediastinal contours are without relevant changed . No pneumothorax or pleural effusion is demonstrated . Moderate degenerative changes are noted in the thoracic spine .
    OUTPUT:
    
Lower lung volumes result in worsening bibasilar atelectasis and obscure assessment of the lung parenchyma , and in particular , the region of the potential pulmonary nodule seen on the previous radiograph .