Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Linear opacities in the lung bases , left greater than right , likely reflect areas of subsegmental atelectasis . No confluent opacity is identified to suggest aspiration or pneumonia . There is no pneumothorax or pneumomediastinum . No vascular congestion , pulmonary edema , or pleural effusions are identified . Cardiomediastinal contours are within normal limits .
    OUTPUT:
    
Bibasilar linear opacities likely reflecting areas of subsegmental atelectasis . No pleural effusions .