Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is no focal consolidation concerning for pneumonia , pleural effusion or pneumothorax . Minimal atelectasis is present in the lung bases . The pulmonary vasculature is not engorged and there is no overt pulmonary edema . The cardiac silhouette remains mildly enlarged . The aortic knob is calcified . The thoracic aorta is slightly tortuous . The mediastinal and hilar contours are otherwise within normal limits . The osseous structures are diffusely demineralized with multilevel degenerative changes in the thoracic spine as well as generalized loss of height of several mid and lower thoracic vertebral bodies , similar to the prior study .
    OUTPUT:
    
Mild bibasilar atelectasis .