Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low , resulting in bronchovascular crowding . There is bibasilar atelectasis . Cardiomediastinal and hilar contours are unremarkable . No pneumothorax or pleural effusion . There is gaseous distention of loops of bowel in the upper abdomen . Mediastinum is not widened .
    OUTPUT:
    
Bibasilar atelectasis , a nonspecific finding . could be due to diaphragm elevation because of gaseous intestinal distention , can also be seen in some instances of acute pulmonary embolism .