Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are well expanded . There are bibasilar opacities , which likely represent atelectasis , but aspiration or infection can not be completely excluded . The lungs are otherwise clear . There is stable cardiomegaly . There is no pleural effusion or pneumothorax . Severe degenerative changes are noted at the shoulders . There is a compression deformity in the midthoracic spine vertebrae , unchanged from prior exam
    OUTPUT:
    
Bibasilar opacities which likely represent atelectasis , but aspiration or infection can not be completely excluded .