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A sessile serrated lesion (SSL) is a premalignant flat (or sessile) lesion of the colon, predominantly seen in the cecum and ascending colon. SSLs are thought to lead to colorectal cancer through the (alternate) serrated pathway. [1] [2] This differs from most colorectal cancer, which arises from mutations starting with inactivation of the APC ...
Serrated polyposis syndrome often does not cause symptoms. The risk of colon cancer is between 25 and 40%. [8] Sessile serrated polyps, as seen during endoscopy or colonoscopy, are flat (rather than raised) and are easily overlooked. Serrated lesions range in size from small (<5 mm) to large, and often have a "mucous cap" overlying the polyp.
A sessile serrated adenoma is suspected in case of any of the following: [4] Size ≥0.5 cm; Location in right colon; If both are present, it is almost always an SSA. Other features causing a suspicion for sessile serrated adenoma are: [4] Dilation of crypts; Branching of crypts; Horizontal glands at the base; Mature mucinous cells at the base ...
Sessile serrated adenoma (SSA) [17] Basal dilation of the crypts; Basal crypt serration; Crypts that run horizontal to the basement membrane (horizontal crypts) Crypt branching. Colorectal adenocarcinoma: 100%: In carcinoma in situ (Tis): cancer cells invading into the lamina propria, and may involve but not penetrate the muscularis mucosae.
Colorectal adenoma Type Risk of containing malignant cells Histopathology definition Tubular adenoma 2% at 1.5 cm [4] Over 75% of volume has tubular appearance. [5] Tubulovillous adenoma 20% to 25% [6] 25–75% villous [5] Villous adenoma 15% [7] to 40% [6] Over 75% villous [5] Sessile serrated adenoma (SSA) [8] Basal dilation of the crypts ...
The risks of progression to colorectal cancer increase if the polyp is larger than 1 cm and contains a higher percentage of villous component. Also, the shape of the polyps is related to the risk of progression into carcinoma. Polyps that are pedunculated (with a stalk) are usually less dangerous than sessile polyps (flat polyps). Sessile ...
A physician's response to detecting an adenoma in a patient will vary according to the type and location of the adenoma among other factors. [citation needed] Different adenomas will grow at different rates, but typically physicians can anticipate the rates of growth because some types of common adenomas progress similarly in most patients.
Traditional serrated adenoma is a premalignant type of polyp found in the colon, often in the distal colon (sigmoid, rectum). Traditional serrated adenomas are a type of serrated polyp, and may occur sporadically or as a part of serrated polyposis syndrome. Traditional serrated adenomas are relatively rare, accounting for less than 1% of all ...
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