Soft tissue
Other tumors
Myoepithelial carcinoma of soft tissue

Author: Vijay Shankar, M.D. (see Reviewers page)

Revised: 15 September 2016, last major update November 2012

Copyright: (c) 2003-2016, PathologyOutlines.com, Inc.

PubMed search: myoepithelial carcinoma of soft tissue

Definition / General
  • Rare tumor with myoepithelial elements but no ductal differentiation
  • May be related to parachordoma or mixed tumor
Epidemiology
  • Equal gender frequency, occurs in all ages, but mean age 38 years
  • 20% occur in children, has an aggressive clinical course
Sites
  • Extremities, limb girdles, viscera, head & neck
Prognostic Factors
Treatment and prognosis:

Case Reports
Gross Description
  • Mean 5 cm, often well circumscribed
Micro Description
  • Nests, cords and sheets of epithelioid, clear, spindle or plasmacytoid cells in hyalinized or chondromyxoid stroma
  • Epithelioid cells predominate in 93% of childhood cases
  • Moderate to severe atypia due to coarse chromatin, prominent nucleoli, nuclear pleomorphism
  • Variable mitotic rate (median 8 / 10 HPF)
  • Often tumor necrosis
Micro Images

Various images

p63

Soft tissue malignant
myoepithelial
carcinomas -
characteristics
Positive Stains
Molecular / Cytogenetics Description
Molecular / Cytogenetics Images

FISH

Differential Diagnosis