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Fig. 1B —48-year-old man with neurofibromatosis type 1 who presented
with pain in right buttock area. Coronal whole-body FDG PET image shows mild
FDG uptake in multiple nerve sheath tumors (black arrows); dominant
mass (white arrow) along right sciatic nerve shows intense FDG uptake
that is suspicious for malignant peripheral nerve sheath tumor (MPNST).