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Introduction :This study aims to evaluate the ability to detective the intestinal polyposis by polyethylene glycol electrolyte solution with contrast medium(PEG-C)fecal tagging with CT colonography in children. methods :13 children of recurrent intussusception or suspicious intestinal polyposis, aged 8m-14y. abrosia 24h and take orally peg-c(2 ml/kg) 8hours before examination.A 24 Fr Forey catheter was placed in the rectum, and the balloon was inflated just before the CT scan. Air was insufflated into the colon at the left decubitus position. The patient was scanned axially with a single run from the colonic flexures to the pelvis in the supine position. The study was performed using Philips 256 iCT. Scanning with a received scanning protocol of low-dose abdomen CT. Then, send pictures to the IntelliSpace—Virtual Colonoscopy,observe the entire colon and distal ileum to identify the location of the lesion and the distance to anal. Results :All studies were performed without complications. CTC showed the entire colon and distal ileum without blind spots in all patients. Polyps were located in the ileocecal junction (n = 8), colon (n = 5). All cases were confirmed by colonoscope or minimally invasive surgery.ED Dose of all patients 0.92-2.43msV. Discussion :CTC is a radiologic modality that is being evaluated screening tool for colorectal polyps .There are few reports related to the technique in children. CTC requires bowel preparation and colonic insufflation. In particular, optimizing bowel preparation is important. PEG-C is provides a clean mucosal surface,to distinguish the neoformation and remained liquid. Colonoscopy provides high diagnostic accuracy, and has been the routine therapeutic modality for diagnosis and treatment of colorectal elevated lesion in children. However, colonoscopy is invasive and often needs sedation. Our data shows that CTC could be carried out safely in children without sedation . A low dose of radiation may not allow the use of stool tagging because barium and iodine-containing oral contrast agents tend to increase noise and streak artifacts. However, the con- trast agent diluted with PEG solution did not generate noise or artifacts in our study. In conclusion, CTC using PEG-C prepa- ration is safe and less invasive compared to conventional CTC due to the shorter examination time and lower radiation dose.