NF1-Associated Inflammatory Polyp of the Colon: First Report of a Sporadic Case

Christina Kanaan, Sophie Cotteret, Pierre Khneisser, Ranya Soufan, Mohamed Amine Bani, Pascal Burtin, Isabelle Sourrouille, Michel Ducreux, Abir Al Ghuzlan, Jean Yves Scoazec

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    3 Citations (Scopus)

    Abstract

    “Juvenile-like (hyperplastic/inflammatory) mucosal polyp” is a term proposed for rare benign mesenchymal lesions of the gastro-intestinal tract so far reported only in patients with type 1 neurofibromatosis (NF1). We report here a first sporadic case of NF1-associated mucosal inflammatory polyp of the colon. The diagnosis was made in a 53-year old female patient with a large polypoid tumor of the cecum. The lesion was predominantly mucosal, made of fibroblast-like cells associated with inflammatory infiltrates rich in eosinophils and containing entrapped, distorted epithelial glands, responsible for the juvenile-like appearance. Whole exome sequencing showed a pathogenic variant of NF1. The patient had no evidence of NF1; no NF1 mutation was detected in normal tissues. Our observation may support the existence of juvenile-like inflammatory polyps associated with NF1 alterations, either germline or somatic. This justifies to test NF1 in difficult-to-classify gastrointestinal mesenchymal tumors.

    Original languageEnglish
    Pages (from-to)823-827
    Number of pages5
    JournalInternational Journal of Surgical Pathology
    Volume30
    Issue number7
    DOIs
    Publication statusPublished - 1 Oct 2022

    Keywords

    • NF1 gene
    • inflammatory fibroid polyp
    • juvenile-like (hyperplastic/inflammatory) mucosal polyp
    • type 1 neurofibromatosis

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