MRI Colonography Versus Conventional Colonoscopy in Detection of Colonic Polyposis.

In The Mid-1970s, Approximately 60 Cases Of Colorectal Cancer Were Diagnosed Per 100,000 People In The United States, And Approximately 51% Of Those Diagnosed Survived Their Disease At Least Five Years. Over The Last Two Decades, Incidence Rates Have Fallen By Nearly 26% Between 1984 And 2004. This Decline Is Likely Due To Increased Colorectal Cancer Screening, Which Allows Physicians To Detect And Remove Colorectal Polyps Before They Progress To Cancer. Yet, Incidence Is Still High: Colorectal Cancer Is The Third Most Commonly Diagnosed Cancer For Both Men And Women. As Of 2004, Approximately 48 Cases Of Colorectal Cancer Were Diagnosed Per 100,000 People In The United States. About 65% Of Men And Women Diagnosed With Colorectal Cancer Now Survive Their Disease At Least Five Years.[1] DEFINITION OF POLYP A Polyp Is Defined As A Fibro Vascular Structure Arising From The Mucosa And Protruding Into The Lumen Of A Hollow Organ With Or Without A Pedicle. ETIOLOGY An Assessment Of Causative Factors Have Shown That • Hyperplastic – Minimal Cancer Potential • Adenomatous – Approximately 90% Of Colon And Rectal Cancers Arise From Adenomas Benefits Of Screening • Cancer Prevention – Removal Of Pre-Cancerous Polyps Prevent Cancer (Unique Aspect Of Colon Cancer Screening) • Improved Survival – Early Detection Markedly Improves Chances Of Long Term Survival Currently Available Procedures Each With Its Drawbacks Include Barium Enema, Which Is Highly Subjective And Expose Patient To Ionizing Radiation. Conventional Colonoscopy: Which Is Invasive And, CT Colonography, Which Expose Patient To Ionizing Radiation And Contrast Medium. Of The Three Techniques Conventional Colonoscopy Has Been Commonly Used.[2] In Recent Years Major Technologic Advances In Diagnostic MRI Have Led To Improve Image Quality Particularly With The Use Of Fast Sequence And Surface Coil. Positive Contrast Like Water/Saline Can Be Used To Distend The Colonic Lumen[3]. This Study Undertaken In The Barnard Institute Of Radiology Gives Our Experience In MR ...