Condition Details
A polyp can be defined as lining of mucosa which projects out in a mushroom shape. If they have a stalk they are called pendulated if there is no stalk present they are called sessile. A colonic polyp is a polyp found in the colon. They are mostly benign but have the potential to become malignant.
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MoreA polyp can be defined as lining of mucosa which projects out in a mushroom shape. If they have a stalk they are called pendulated if there is no stalk present they are called sessile. A colonic polyp is a polyp found in the colon. They are mostly benign but have the potential to become malignant.
Neoplastic polyp - Neoplastic polyps of the bowel are often benign hence called adenomas. An adenoma is tumour of columnar cells or glandular tissue. Neoplastic polyps can be further broken down into tubular, tubularvillous or villous. They are all broken down into these categories by histology. The villous subdivision is the worse one to have because the have the most malignant potential. The reason for this is because the villous are projections into the lumen and hence has a bigger surface area and therefore they have a greater potential for malignant change.
Metaplastic polyp - Metaplastic polyps are an overgrowth of tissue of normal mucosa. The name "metaplastic polyp" is actually a misnomer as there is no change in epithelia. Metaplastic polyps are the most common type of colonic polyp followed by adenoma polyps. But unlike adenomas they have no malignant potential and rarely grow larger than 5mm.
Hamartomatous polyp - They are growths found in organs as a result of faulty development. They are normally made up of a mixture of tissues. They grow at the normal rate of the host tissue and rarely cause problems such as compression. A common example of a hamartomatous lesion is a strawberry naevus. Hamartomatous polyps are often found by chance; occurring in syndromes such as Peutz-Jegher or Juvenile Polyposis Syndrome.
Inflammatory polyp - These are polyps which are associated with inflammatory conditions such as Ulcerative Colitis and Crohns disease.
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