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NCI Dictionary of Cancer Terms

malignant peripheral nerve sheath tumor  listen  (muh-LIG-nunt peh-RIH-feh-rul ... TOO-mer)

  A type of soft tissue sarcoma that develops in cells that form a protective sheath (covering) around peripheral nerves, which are nerves that are outside of the central nervous system (brain and spinal cord). Also called MPNST.