Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable semi upright chest radiograph was obtained . Lungs are low in volume resulting in bronchovascular crowding along with right greater than left basal opacities which are likely atelectasis but aspiration could be considered . Mild vascular congestion is seen without overt edema . Bibasilar linear atelectasis is seen . The heart is top normal in size with tortuous aortic contour . Ventriculoperitoneal shunt catheter is seen in the right hemithorax and abdomen . Moderate gaseous gastric distention is noted .
    OUTPUT:
    
Low lung volumes with bibasilar opacities , most likely atelectasis though aspiration should be considered . Mild vascular congestion .