Radiological feature of small intestinal obstruction | NEET Based MCQ

The most characteristic radiological feature of small intestinal obstruction is; 

A. featureless abdomen 
B. stepladder pattern 
C. concertina effect 
D. prominent valvulae conniventes

Ans.D. (prominent valvulae conniventes)
Small bowel obstruction
Mechanical small bowel obstruction normally causes small bowel dilatation, with an accumulation of both gas and fluid and a reduction in caliber of the large bowel.
 Diagnosis of small-bowel obstruction can be made on plain abdominal radiographs in 60—70% of patients. The distal ileum is the site of small bowel obstruction in most patients with normal or equivocal plain abdominal radiographs.