Figure 3b.  Meniscus and coiled spring signs. (a) Image from a barium enema study shows the meniscus sign in the contrast material–filled distal colon. (b) Image from a barium enema study performed after partial reduction of the intussusception shows the coiled spring sign. Contrast material outlines the facing mucosal surfaces of the intussuscipiens and the intussusceptum. (c) Image from a barium enema study performed after complete reduction of the intussusception shows barium flowing freely into the ileum.