is colon or rectal cancer? Then
read the NCI booklet,
and the Cancer Net Patient sites for
and a review about the cause of colon and rectal cancer
here and good patient
information from up-to-date
here and the other good colon and rectal cancer links.
Diet and cancer here.
And see what are the most common locations for cancer
Age and colon and rectal cancer.
Go here for a review on symptoms and evaluation.
Main colon and rectal anatomy section go here, and for pictures of CT or PET Scans go here
see detailed anatomy picture of the
rectum (and note that the rectum
is below the peritoneal reflection
pic #1 and pic#2) or a cancer on a barium enema.
Radiation is more commonly used for cancers of the rectum than colon. Measured from the anal verge the anus is the most distal 4cm, the rectum is then from 4 to 16cm (12cm in length) the sigmoid starts at roughly 17cm and is about 40cm in length.( so extends 17 to 57cm from the anal verge.)
|One-Time Screening for Colorectal
Cancer with Combined Fecal Occult-Blood Testing and Examination of the Distal Colon
D. A. Lieberman and Others NEJM 2001:345:555-560
A total of 2885 subjects returned the three specimen cards for fecal occult-blood testing and underwent a complete colonoscopic examination. A total of 23.9 percent of subjects with advanced neoplasia had a positive test for fecal occult blood. Sigmoidoscopy identified 70.3 percent of all subjects with advanced neoplasia. Combined one-time screening with a fecal occult-blood test and sigmoidoscopy identified 75.8 percent of subjects with advanced neoplasia. Conclusions One-time screening with both a fecal occult-blood test with rehydration and sigmoidoscopy fails to detect advanced colonic neoplasia in 24 percent of subjects with the condition.