Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . The cardiac , mediastinal and hilar contours remain unchanged . Bronchovascular structures are crowded without overt pulmonary edema . Streaky opacities in the left lung base likely reflect areas of atelectasis . No focal consolidation , pleural effusion or pneumothorax is identified . Multilevel degenerative changes are re - demonstrated in the imaged thoracic spine .
    OUTPUT:
    
Streaky opacity in the left lung base , likely atelectasis . Infection can not be completely excluded in the correct clinical setting .