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• W2565335586 abstract "Aims Massive gastric polyposis is a rare entity that is often associated with juvenile polyposis syndrome ( JPS ). The aim of this study was to evaluate the clinicopathological features of 22 patients with abundant gastric juvenile‐type or hyperplastic‐like polyps. Methods and results The study included 12 males and 10 females with a median age of 48 years (range: 13–79 years). Fourteen (64%) patients carried a diagnosis of JPS , and three had prior gastrointestinal adenocarcinomas. Patients without known JPS presented at an older median age (60 years versus 40 years; P = 0.0068). Clinical symptoms included nausea, vomiting, and abdominal pain; 23% of patients were asymptomatic. Eighteen cases showed complete or near‐complete carpeting of the gastric mucosa by innumerable polyps, ranging from a few millimetres to ~100 mm. Most polyps formed long, bulbous projections and had characteristic histological features, including a smooth outer contour, prominent stromal oedema, and widely spaced, often cystically dilated glands lined by foveolar epithelium; some polyps had less stroma and more hyperplastic foveolar epithelium. All had normal underlying or adjacent mucosa. Four (18%) cases harboured adenocarcinoma, and seven (32%) others showed dysplasia. SMAD 4 immunohistochemical staining showed patchy loss in polyps from 19 of 20 cases tested. Five of six (84%) patients tested had a germline SMAD 4 mutation. Conclusions Massive gastric juvenile‐type polyposis can occur in patients with and without known JPS , and may mimic different conditions, such as other polyposis syndromes and Ménétrier disease. Pathologists play an important role in disease classification, as some patients lack a family or personal history of JPS , have few if any colonic polyps, and may not harbour diagnostic germline mutations." @default.
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• W2565335586 date "2017-02-16" @default.
• W2565335586 modified "2023-10-04" @default.
• W2565335586 title "Massive gastric juvenile-type polyposis: a clinicopathological analysis of 22 cases" @default.
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• W2565335586 doi "https://doi.org/10.1111/his.13149" @default.
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