Other malignancies
Solitary fibrous tumor

Authors: Komal Arora, M.D. (see Authors page)

Revised: 1 September 2016, last major update June 2012

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

PubMed Search: prostatic solitary fibrous tumor

Cite this page: Solitary fibrous tumor. website. Accessed October 28th, 2016.
Definition / General
  • Rare (< 50 cases reported)
  • Often misdiagnosed
  • Usually does not recur after excision (Hum Pathol 2000;31:63), but some cases have malignant behavior
Case Reports
Micro Description
  • Collagenization, hemangiopericytoma-like foci, spindled cells between strips of collagen
  • Two cases described were
    • (a) well circumscribed, minimal mitotic activity or pleomorphism and
    • (b) cellular, less collagenous, more diffuse growth pattern, cytologic atypia, high mitotic activity (Arch Pathol Lab Med 2001;125:274)
Micro Images
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Various images

Positive Stains
Differential Diagnosis
  • Other spindle cell neoplasms of the prostate
  • Gastrointestinal stromal tumors that may arise from the rectal wall with invasion of the prostate or from the region between the rectum and the prostate (Am J Surg Pathol 2007;31:870)
Additional References