Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lung volumes are low , limiting evaluation . A streaky opacity at the left base is likely atelectasis . There is no large focal airspace consolidation to suggest pneumonia . There is no pulmonary edema , pleural effusions or pneumothorax . The mediastinal contours are normal . The heart size is at the upper limits of normal .
    OUTPUT:
    
Left basilar atelectasis . No definite evidence of pneumonia .