Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Linear opacities at the lung bases are consistent with areas of subsegmental atelectasis . No confluent consolidation is identified to suggest pneumonia . Overall diffuse increased attenuation of the lungs is likely secondary to technical factors since no pulmonary vascular congestion or overt edema is identified . There are no pleural effusions . Cardiomediastinal and hilar contours are within normal limits . No pneumothorax is evident .
    OUTPUT:
    
Bibasilar atelectasis without evidence of pneumonia or pulmonary edema .