Rectal polyp

Colon polyps
Polyp of sigmoid colon as revealed by colonoscopy. Approximately 1 cm in diameter. The polyp was removed by snare cautery
Classification and external resources
Specialty	gastroenterology
ICD-10	K63.5 & various
MedlinePlus	000266
eMedicine	med/414
MeSH	C23.300.825
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A colorectal polyp is a polyp (fleshy growth) occurring on the lining of the colon or rectum. Untreated colorectal polyps can develop into colorectal cancer.

Colorectal polyps are often classified by their behaviour (i.e. benign vs. malignant) or cause (e.g. as a consequence of inflammatory bowel disease). They may be benign (e.g. hyperplastic polyp), pre-malignant (e.g. tubular adenoma) or malignant (e.g. colorectal adenocarcinoma).

Colorectal polyps are not usually associated with symptoms. When they occur, symptoms include rectal bleeding, bloody stools, abdominal pain and fatigue. A change in bowel habits may occur including constipation and diarrhoea. Occasionally, if a polyp is big enough to cause a bowel obstruction, there may be nausea, vomiting and severe constipation.

The most common general classification is:

Most hyperplastic polyps are found in the distal colon and rectum. They have no malignant potential, which means that they are no more likely than normal tissue to eventually become a cancer.

Hyperplastic polyps are serrated polyps. Hyperplastic polyps have three histologic patterns of growth: microvesicular, goblet cell and mucin poor.

Hyperplastic polyposis syndrome is a rare condition that has been defined by the World Health Organization as either:

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