Patient—colorectal polyp type, code N[N]

Identifying and definitional attributes

• Health, Standard 29/08/2014

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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

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

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