Small round-cell type of malignant peripheral nerve sheath tumor

Satoshi Abe, Tetsuo Imamura, Pyoun Park, Hirotaka Nakano, Hajime Okita, Jun Ichi Hata, Akio Tateishi

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)


Five cases of primitive, small, round-cell tumor that are a type of hitherto unclassified neurogenic sarcoma are described. The tumors were located deep within the soft tissue of the trunks and limbs without association with major nerves. The histologic features consisted mainly of uniform, small, round, tumor cells with scanty cytoplasm. Foci of uniform, short, spindle-shaped tumor cells arranged in whorl-like patterns were observed in some areas. Although the immunoreactivity for the neural markers, Leu-7 and MIC-2, was not marked, cell processes and fragmentous basal laminae, which are ultrastructural neural features, were found in both spindle-shaped and round tumor cells. In four cases, EWS chimeric transcripts were analyzed by reverse-transcription polymerase chain reaction. EWS chimeric mRNA (EWS-FLI-1, EWS-ERG, EWS-E1AF, EWS-ETV1, EWS-FEV) was not detected in any cases. The tumors were not consistent with peripheral primitive neuroectodermal tumor. We propose them as a small round-cell type of MPNST that might differentiate toward the immature neural cells.

Original languageEnglish
Pages (from-to)747-753
Number of pages7
JournalModern Pathology
Issue number8
Publication statusPublished - 1998 Aug 1


  • Malignant peripheral nerve sheath tumor
  • Neural markers
  • Neurogenic sarcoma
  • Peripheral primitive neuroectodermal tumor
  • Schwannian differentiation
  • Small round cell tumor
  • Ultrastructure

ASJC Scopus subject areas

  • Pathology and Forensic Medicine


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