Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low with bronchovascular crowding . Streaky horizontal opacities in the left lung base it is probably atelectasis . Retrocardiac opacity with slight indistinctness of the lateral aspect of the descending aorta may also reflect atelectasis , although concurrent infection appropriate clinical situation is possible . No edema , effusion , or pneumothorax . The heart is top - normal in size . No acute osseous abnormality . Degenerative changes in in the bilateral AC joints are moderate . Moderate degenerative change since the visualized thoracic spine .
    OUTPUT:
    
Low lung volumes with bronchovascular crowding . Left basilar opacity , potentially atelectasis noting that infection can not be excluded .