Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Mildly limited study due to patient rotation . Within limitation , the cardiomediastinal silhouette is stable in size . The thoracic aorta is calcified and unfolded , as on prior . The hila are within normal limits . There are low lung volumes with crowding of normal bronchovascular structures . Patchy opacities at the left more than right lung base have a similar appearance to prior studies and likely reflect atelectasis . O Therwise , there is no focal lung consolidation . There is mild prominence of vascular markings , but no pulmonary edema . There is no pneumothorax or sizable pleural effusion . Chronic right posterior multilevel rib fractures are unchanged in appearance , as is lower thoracic spine kyphotic angulation due to pre-existing thoracic spine compression deformities , not well evaluated on this exam .
    OUTPUT:
    
Low lung volumes with bibasilar atelectasis . No focal consolidation or gross effusion . Mild vascular plethora , without overt CHF .