Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable upright radiograph provided . There are bibasilar heterogeneous linear opacities , similar in appearance and extent to the prior studies and consistent with atelectasis . The lungs are otherwise clear . The hilar and cardiomediastinal contours are normal . Pulmonary vascularity is normal . There is a tracheostomy tube and collar in place . There is a markedly distended gastric bubble with a distended loop of colon overlying the left upper quadrant of the abdomen .
    OUTPUT:
    
1 . Bibasilar atelectasis without evidence of pneumonia . 2 . Gaseous gastric and colonic dilation , incompletely imaged . Abdominal radiograph may be obtained if clinically appropriate