Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Low lung volumes are present . The heart remains mildly enlarged with left ventricular predominance . The aorta is tortuous . There is crowding of the bronchovascular structures but no frank pulmonary edema is detected . Calcified mediastinal lymph nodes are again noted . There are streaky bibasilar opacities likely reflective of atelectasis , without focal consolidation . No pleural effusion or pneumothorax is identified . There are multilevel degenerative changes in the thoracic spine . Small hiatal hernia is present .
    OUTPUT:
    
Mild bibasilar atelectasis in the setting of low lung volumes .