Soft tissue
Peripheral nerve
Malignant triton tumor (MTT)

Author: Vijay Shankar, M.D.

Revised: 30 January 2018, last major update November 2012

Copyright: (c) 2002-2018, PathologyOutlines.com, Inc.

PubMed Search: Malignant triton tumor

See also: malignant peripheral nerve sheath tumor (MPNST), epithelioid MPNST

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Cite this page: Shankar, V. Malignant triton tumor (MTT). PathologyOutlines.com website. http://www.pathologyoutlines.com/topic/softtissuempnsttriton.html. Accessed July 24th, 2019.
Definition / general
  • MPNST with well developed skeletal muscle component
  • Diagnostic criteria of Woodruff (Cancer 1973;32:426):
    • Tumor arises along a peripheral nerve, in a ganglioneuroma, in NF1 patient, or is a metastasis from such a tumor
    • Tumor has characteristics of Schwann cell tumor
    • Rhabdomyoblasts arise from body of tumor
Case reports
Gross images

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Buttock mass

Microscopic (histologic) images

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Retroperitoneal tumor

Rhabdomyoblastic differentiation

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