Table 4

WHO Classification for PNSTsa

Schwannoma (WHO grade I)
 Cellular
 Plexiform
 Melanotic
Neurofibroma (WHO grade I)
 Plexiform
Perineurioma
 Inraneural perineurioma
 Soft tissue perineurioma
MPNST (WHO grade III or IV)
 Epitheloid
MPNST with divergent mesenchymal differentiation and/or epithelial differentiation
 Melanotic
 Melanotic psammomatous
  • a PNST, peripheral nerve sheath tumor; MPNST, malignant PNST.