Colonography Versus Colonoscopy in High Risk Patient

Surveillance of patients with a personal history of advanced adenoma or CRC:

• Informed consent obtained
• Age ≥ 18 and ≤ 80 years old
• History of advanced adenomatous polyps
• Or history of non metastatic CRC with curative surgery and without other treatment more than 2 years before enrollment.
• Previous medical examination

Screening of patients with a Family history of CRC at high risk:

• Informed consent obtained
• Age ≥ 18 and ≤ 80 years old
• First degree family history of colorectal cancer diagnosed \<60yrs during the five previous years-Previous medical examination

Exclusion Criteria:

Personal histories

• Age \< 18 or >80 years old
• history of non adenomatous polyps
• history of Metastatic CRC
• familial adenomatous polyposis, Peutz-Jeghers syndrome, hereditary non polyposis colorectal cancer (HNPCC), juvenile polyposis syndrome
• Familial history of familial adenomatous polyposis
• Personal history of subtotal colectomy (but not of hemicolectomy, to confer to inclusion criteria)
• Colonoscopy with a polyps resection dated more than 5 years and less than 2 years prior to enrollment.
• Enrollment in another protocol
• no health insurance affiliation Family histories
• Age \< 18 or >80 years old
• Patients with one or several family histories of first degree colorectal cancer occured to unknown age or diagnosed after 60 years old.
• Eligible patients having already undergone colonoscopy screening
• no health insurance affiliation