All are true about radiological features of the intestinal obstruction except:
The small intestines are said to be dilated if the loops of bowel have a diameter of > 3cm. The large bowel are said to be dilated if they are >5 cm for distal bowel and > 9 cm for proximal bowel. Volvulus and mesenteric ischemia have characteristic signs on abdominal films. The absence of air-fluid levels on plain supine radiographs does not rule out presence of an obstruction.