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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 ...
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. Serrated lesions are frequently located on the folds of the colon (haustral folds). [citation needed]
Micrograph of a sessile serrated adenoma. H&E stain. Sessile serrated adenomas are characterized by (1) basal dilation of the crypts, (2) basal crypt serration, (3) crypts that run horizontal to the basement membrane (horizontal crypts), and (4) crypt branching. The most common of these features is basal dilation of the crypts.
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.
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Sessile Serrated Adenoma, Transverse Colon, 0.4 cm. Pathological and histological images courtesy of Ed Uthman at flickr. Date: 16 June 2009, 11:12: Source: Sessile Serrated Adenoma, Transverse Colon, 0.4 cm. Uploaded by CFCF; Author: Ed Uthman from Houston, TX, USA
Aside from indicating that the Nixon administration might be willing to resume full-scale bombing of North Vietnam, the operation did not achieve very impressive results. [4]: 203 The VPAF campaign aimed precisely at countering the U.S. air interdiction campaign to which the President had keyed all his hopes for success, in making North Vietnam give up the fight and negotiate and in giving ...