Abstract

We describe a patient who was diagnosed with multiple tubulleuvillous adenomas with focus of high-grade tubular dysplasia all over the colonic mucosa, discovered during a colonoscopy performed during an episode of melena. Genetic testing has identified a germline truncating mutation at the codon (5q22.2) of the adenomatous polyposis (APC) gene. This mutation is localized in the alternately spliced region of exon 12, a region which is associated with an attenuated familial adenomatous polyposis (PAFA) phenotype. Our patient had no extracolic manifestations of PAFA and none of her relatives had a history of rectocolic polyposis. Treatment consisted of colectomy with ileorectal anastomosis. PAFA is an ill-defined condition of unknown prevalence and penetrance, requiring individual treatment and lifelong monitoring. It is essential to identify these patients with a view to setting up appropriate endoscopic surveillance at an early age in family members carrying this mutation, due to the marked intra-family phenotypic variance.

Keywords: attenuated familial adenomatous polyposis, adenomatous polyposis gene, exon12, colectomy with ileorectal anastomosis , case report, Morocco

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N'khaili, A., Aouroud, H., Semlali, R., Chakor, F., Errami, A. A., Oubaha, S., … Krati, K. (2022). Melena Revealing an Attenuated Familial Adenomatous Polyposis in an Elderly Patient: A Case Report. International Journal of Innovative Research in Medical Science, 7(01), 55–57. https://doi.org/10.23958/ijirms/vol07-i01/1324

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