Features of intussusception are-

Answer 'b' i.e. Target sign Radiological investigations and signs seen in Intussusception Plain film - features of small intestinal obstruction - abdominal soft tissue density in some cases which may show target sign --> soft-tissue mass with concentric area of lucency due to mesenteric fat meniscus sign ---> crescent of gas within colonic lumen that outlines the apex of intussusception Barium Enema Claw 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. Ultrasound Target sign Bull's eye sign Pseudokidney sign Also know Dance sign - feeling of emptiness in . iliac fossa on palpation