An adenoma is a benign tumour that arises from epithelial cells that line the inside surface of an organ. All adenomas have malignant potential. Adenomas have several different growth patterns. CODE 1 Hyperplastic polyp A type of polyp that has a low risk, if any, of developing into a cancer. However, people with multiple hyperplastic polyps are associated with an increased risk of bowel cancer.
CODE 2 Tubular adenoma Tubular adenoma composed of epithelial tissue resembling a tubular gland. This is most of the most common growth patterns. Most adenomas that are small have a tubular growth pattern. CODE 3 Tubulovillous adenoma Many adenomas have a mixture of both growth patterns. Tubulovillous adenomas are neoplams that resemble a mixture of both tubular and villous adenoma growth patterns. CODE 4 Villous adenoma Villous adenomas are composed of mucinous epithelium covering delicate vascular projections. Larger adenomas may have a villous growth pattern. Larger adenomas more often have cancers developing in them. Adenomas with a villous growth pattern are also more likely to have cancers develop in them. CODE 5 Sessile serrated adenoma Sessile serrated polyps have a saw tooth appearance under the microscope, and tend to grow as slightly flattened, broad-based polyps. CODE 6 Traditional serrated adenoma Traditional serrated adenomas have a saw tooth appearance under the microscope. CODE 7 Adenoma not otherwise classified A benign growth that does not fit the classification listed above. CODE 8 Carcinoma A cancer's growth that begins in the lining layer (epithelial cells) of organs. |