Résumé
Les polypes plans du côlon et du rectum encore appelés lésions planes répondent à des entités microscopiques diverses telles que: polypes hyperplasiques, adénomes, adénocarcinomes intramuqueux voire infiltrants. L’étude de la littérature permet de dégager certaines correspondances entre les aspects macroscopiques et microscopiques et de souligner le caractère prédictif péjoratif du type plan avec dépression.
L’examen anatomopathologique des néoplasies planes permet d’authentifier deux voies d’histogénèse du cancer colique en dehors de la voie classique: la moins fréquente reposant sur la filiation adénome plan/adénocarcinome plan. l’autre méritant la dénomination «de novo».
Summary
That flat colorectal polyps or flat lesions (considered as synonymous) correspond to various histological entities such as hyperplastic polyps, adenomas, intramucosal or invasive adenocarcinomas. Previous studies enhance that central depression in flat neoplastic lesions should be considered a possible marker for severe dysplasia.
The histopathological studies of flat neoplastic lesions suggest that 70% to 90% flat superficial type colorectal carcinoma develop via a de novo pathway while the others arise from preexisting flat adenoma via the adenoma carcinoma sequence.
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Diebold, M.D., Chevalier, P., Fremond, L. et al. Lésions planes colorectales: corrélations histo-endoscopiques. Acta Endosc 29, 85–90 (1999). https://doi.org/10.1007/BF03020275
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DOI: https://doi.org/10.1007/BF03020275