Cerebrospinal fluid dissemination of an intracranial malignant peripheral nerve sheath tumor in the sellar region: illustrative case.

Background: Malignant peripheral nerve sheath tumors (MPNSTs) are uncommon types of soft tissue sarcomas. The occurrence of intracranial MPNSTs in the sellar region is exceedingly rare.

Observations: A 37-year-old female, who had undergone transnasal surgery for a pituitary adenoma followed by adjuvant stereotactic radiotherapy 10 years earlier, was diagnosed with an intracranial MPNST in the sellar region.