Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac , mediastinal , and hilar contours are unremarkable . Aortic calcifications are noted . There is a faint linear density at the lateral right base on the PA view , not well seen on the lateral view . There is no evidence for pulmonary edema or pleural effusion . There are degenerative changes and ossification of the anterior longitudinal ligament in the thoracic spine .
    OUTPUT:
    
Faint linear density at the lateral right base , likely in the right lower ___ , ___ represent atelectasis , but pneumonia can not be excluded .