AbstractOne of the most important benign tumors in neurofibromatosis type 1
(NF1) is plexiform neurofibroma, and there is a risk of developing malignant
peripheral nerve sheath tumor (MPNST) throughout life approximately 10%. However
lesion characterization by anatomical imaging methods are not possible. Because
of that most of cases goes to biopsy. Using of fluorodeoxyglucose-positron
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