Other malignancies
Malignant peripheral nerve sheath tumor (MPNST)

Author: Hanni Gulwani, M.D. (see Authors page)

Revised: 21 June 2018, last major update December 2012

Copyright: (c) 2003-2018,, Inc.

PubMed Search: Malignant peripheral nerve sheath tumor mediastinum[TI]

Cite this page: Gulwani, H. Malignant peripheral nerve sheath tumor (MPNST). website. Accessed July 19th, 2018.
Clinical features
  • Often associated with neurofibromatosis
  • 4% of MPNST show perineurial cell differentiation (Am J Surg Pathol 1998;22:1368)
  • Often spreads to pleura or lungs
Prognostic factors
  • Extremely poor prognosis if glandular or rhabdomyosarcomatous features
Case reports
Gross description
  • Unencapsulated, degenerative changes common (fat, hemorrhage, cysts)
Microscopic (histologic) description
  • Bizarre cells and tumor giant cells
  • Also atypical mitotic figures and necrosis
  • May have areas of uniform bland spindle cells
  • Rarely has rhabdomyosarcomatous features ("triton tumor") or glandular differentiation
Microscopic (histologic) images

Images hosted on other servers:

Low grade tumor has
increased cellularity,
nuclear atypia, scattered
mitotic figures

Fascicular proliferation of atypical spindle cells