Other benign tumors

Inflammatory myofibroblastic tumor

Topic Completed: 1 April 2010

Minor changes: 14 May 2021

Copyright: 2002-2021,, Inc.

PubMed Search: Inflammatory myofibroblastic tumor breast

Hind Warzecha, M.D.
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Cite this page: Nassar H. Inflammatory myofibroblastic tumor. website. Accessed October 25th, 2021.
Definition / general
  • Tumor of myofibroblastic spindle cells and inflammatory cells
  • Also called inflammatory pseudotumor, plasma cell granuloma
  • Extremely rare in breast with < 20 cases reported
Radiology images

Contributed by Dr. Mark R. Wick:


Case reports
Gross description
  • Firm, circumscribed, yellow
Microscopic (histologic) description
  • Nodular with fibrovascular stroma containing myofibroblast-like cells and lymphoplasmacytic infiltrate
  • May have primarily inflammatory features (diffuse lymphoplasmacytic infiltration and lymphoid follicles), resemble myofibroblastic tumors or be hypocellular (scar-like)
  • Often mixed patterns (Am J Clin Path 1988;90:627)
Microscopic (histologic) images

Contributed by Dr. Mark R. Wick

Inflammatory myofibroblastic tumor

Images hosted on other servers:

Various images

Cytology description
  • Inflammatory lesion with occasional aggregates of cellular connective tissue fragments, sheets of uniform ductal epithelial cells with myoepithelial cells, spindle cells, lymphocytes and histiocytelike cells (Acta Cytol 2003;47:1077)
Positive stains
Molecular / cytogenetics description
Differential diagnosis
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