Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Low lung volumes are present . Mild cardiomegaly with a left ventricular predominance is unchanged compared to the prior exam . The aorta remains tortuous . The pulmonary vascularity is not engorged . Streaky bibasilar opacities likely reflect atelectasis . No focal consolidation , pleural effusion or pneumothorax is present . Prominence of the right superior mediastinal contour is unchanged , and again may relate to tortuous vessels . There are no acute osseous abnormalities . Degenerative changes of the thoracic spine are present .
    OUTPUT:
    
Mild bibasilar atelectasis .