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  • Title: The characteristics of 76 atypical neurofibromas as precursors to neurofibromatosis 1 associated malignant peripheral nerve sheath tumors.
    Author: Higham CS, Dombi E, Rogiers A, Bhaumik S, Pans S, Connor SEJ, Miettinen M, Sciot R, Tirabosco R, Brems H, Baldwin A, Legius E, Widemann BC, Ferner RE.
    Journal: Neuro Oncol; 2018 May 18; 20(6):818-825. PubMed ID: 29409029.
    Abstract:
    BACKGROUND: Neurofibromatosis 1 (NF1) leads to the development of benign and malignant peripheral nerve sheath tumors (MPNST). MPNST have been described to develop in preexisting benign plexiform neurofibromas (PN) and have a poor prognosis. Atypical neurofibromas (ANF) were recently described as precursor lesions for MPNST, making early detection and management of ANF a possible strategy to prevent MPNST. We aimed to clinically characterize ANF and identify management approaches. METHODS: We analyzed clinical, imaging, and pathology findings of all patients with NF1 and ANF at 3 institutions. RESULTS: Sixty-three patients had 76 ANF (32M/31F; median age 27.1 y). On MRI, most ANF appeared as distinct nodular lesions and were 18F-fluorodeoxyglucose (FDG) avid. Forty-six ANF were associated with pain, 19 with motor weakness, 45 were palpable or visible, and 13 had no clinical signs. Completely resected ANF (N = 57) have not recurred (median follow-up, 4.1 y; range, 0-14 y). Four ANF transformed into MPNST and 17 patients had a history of MPNST in a different location than was their ANF. CONCLUSIONS: Growth of distinct nodular lesions, pain, and FDG-PET avidity should raise concern for ANF in NF1. Patients with ANF are at greater risk for development of MPNST. Complete resection of ANF may prevent development of MPNST.
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