CNS tumor
Lymphoma and other hematopoietic lesions
Inflammatory pseudotumor

Author: Nat Pernick, M.D. (see Authors page)

Revised: 8 September 2017, last major update January 2006

Copyright: (c) 2002-2017,, Inc.

PubMed Search: Inflammatory pseudotumor CNS

Cite this page: Pernick, N. Inflammatory pseudotumor. website. Accessed March 24th, 2018.
Definition / general
  • Also called spindle cell pseudotumor, plasma cell granuloma, inflammatory myofibroblastic tumor
  • Rare, nonneoplastic lesion
  • May be intracranial extension of extracranial tumor
  • Usually in lung and airways
  • Rarely intracranial or within spinal cord affecting young men
Case reports
  • Complete resection, variable radiation therapy or steroids
  • May recur
Microscopic (histologic) description
  • Inflammatory proliferation of polyclonal plasma cells with variable lymphocytes, neutrophils, eosinophils and histiocytes
  • Fibrovascular background
  • Variable giant cells, calcifications, circular fibrosis of small veins
Microscopic (histologic) images

Images hosted on other servers:


  • Plasma cells are polyclonal
  • Acid fast bacilli if due to mycobacteria
Differential diagnosis
  • Lymphoma: monoclonal
  • Lymphoplasmacyte rich meningioma: has areas of classic meningioma, EMA+
  • Plasmacytoma
Additional references