For the plain film radiographic detection of intussusception, supine Cross-Table Lateral Radiograph (SCLR) of abdomen has been introduced recently. Our study was done to evaluate the usefulness of the SCLR prospectively and tried to compare with the conventional vertical beam radiograph of abdomen. In the 40 infants which were suspected as intussusception clinically, conventional vertical beam radiograph of abdomen and SCLR were interpreted before barium reduction and analysed after barium reduction. As a result, sensitivity, specificity and overall accuracy of the vertical beam radiograph of abdomen only in the detection of ileocolic intussusception were 76%, 100% and 78%, those of the SCLR only were 65%, 100% and 68%, those of the conventional vertical beam radiograph plus the SCLR were 79%, 100% and 80%. Therefore we think that the SCLR would not be a useful complementary plain film inthe diagnosis of the ileocolic intussusception.