COMPARATIVE STUDY
JOURNAL ARTICLE
RESEARCH SUPPORT, N.I.H., EXTRAMURAL
RESEARCH SUPPORT, NON-U.S. GOV'T
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Morphologic characterization of hamartomatous gastrointestinal polyps in Cowden syndrome, Peutz-Jeghers syndrome, and juvenile polyposis syndrome.

Human Pathology 2016 March
The morphologic features of the gastrointestinal polyps in hamartomatous polyposis syndromes are poorly defined. Our aim was to better characterize the gastrointestinal hamartomas in these syndromes. A blinded review was performed regarding many histologic features for every polyp. The study included 15 Cowden syndrome, 13 Peutz-Jeghers (PJS), 12 juvenile polyposis (JuvPS) patients, and 32 cases of sporadic hamartomatous polyps. A total of 375 polyps were examined. Cowden syndrome polyps were characteristically colonic, sessile, small, without surface erosion, and showing mildly inflamed fibrotic lamina propria with smooth muscle proliferation and lymphoid follicles. They showed the least degree of cystic glands and had no thick mucin. Uncommon but specific features were ganglion cells and nerve fibers within the lamina propria and mucosal fat. PJS polyps were typically of small or large bowel origin, often exophytic, seldom eroded, with inflamed edematous and fibrotic lamina propria and dilated cystic glands filled with often thick mucin. All PJS polyps showed smooth muscle proliferation, frequently widespread. The polyps of JuvPS were typically colonic, large, exophytic, eroded, with strikingly edematous, fibrotic markedly inflamed lamina propria, cystic glands filled with frequently thick mucin, and the least degree of smooth muscle proliferation. Nonsyndromic hamartomatous polyps were similar to JuvPS polyps; however, they were more often colonic, were smaller, showed more widespread smooth muscle proliferation, and were less likely to contain thick mucin. In conclusion, we were able to define the characteristic hamartomatous polyp for each hamartomatous polyposis syndrome. Awareness to these features may aid in the diagnosis of these rare syndromes.

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