Contribution of modern imaging in rectosigmoid neoplastic disease (comparison with fiberoptic endoscopy).

Double-contrast enema (DCE) remains the primary diagnostic exploration. Its specific method and interpretation require skillful handling. Unlike colonoscopy, DCE results in false-positives, the frequency of which varies widely in function of the skill of the interpretation. False negatives reach a significant level from a threshold of size which can be fixed at 5 mm. Despite these drawbacks, double-contrast enema, which is an exploration involving a two level of invasiveness and which provides a good panoramic image of the colon should remain the primary exploration in routine check-ups. DCE is an essential part of loco-regional evaluation. It is important in post-operative check-ups to screen for relapses. Post-operative follow-up should be systematic, involving an initial reference examination after 4 months, a check-up every 6 months for two years and then an annual check-up.