Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There are low lung volumes . Heart size remains mildly enlarged but unchanged . The aorta is unfolded . There is no pulmonary vascular congestion . Streaky bibasilar opacities , more so in the retrocardiac region , likely reflect atelectasis in this setting of low lung volumes . No focal consolidation or pleural effusion is noted . There is no pneumothorax . No acute osseous abnormalities identified . There are mild degenerative changes in the thoracic spine .
    OUTPUT:
    
Lung volumes with mild bibasilar atelectasis .