This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Small Intestine - Small Bowel Obstruction, Subject name: Surgery
Coiled spring appearance - 
Select and explain. 
A. Intusseption, B. Achalasia, C. Duodenal perforation, D. Chronic pancreatitis
A: Intusseption
Answer: A: Intusseption 
Explanation: Ans. is 'a' i.e., Intusseption Radiological investigations and signs seen in IntussusceptionPlain filmo Features of small intestinal obstruction o Abdominal soft tissue density in some cases which may showTarget sign - soft-tissue mass with concentric area of lucency due to mesenteric fatMeniscus sign - crescent of gas within colonic lumen that outlines the apex of intussusceptionBarium EnemaClaw sign - rounded apex of intussusception protrudes into the contrast column Coiled spring sign - edematous mucosal folds of returning limb of intussusceptum outlined by contrast material.Ultrasoundo Target signo Bull's eye signo Pseudokidney signAlso knowo Dance sign - feeling of emptiness in rt. iliac fossa on palpation