Other tumors
Solitary fibrous tumor

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

Revised: 27 March 2018, last major update December 2013

Copyright: (c) 2003-2018,, Inc.

PubMed Search: Solitary fibrous tumor[TI] pleura[TI] full text[sb]

See also: Malignant solitary fibrous tumors
Cite this page: Pernick, N. Solitary fibrous tumor. website. Accessed October 16th, 2018.
Definition / general
  • Also called localized fibrous tumor
  • Formerly called benign or solitary fibrous mesothelioma
  • Confined to surface of lung, usually does not produce a pleural effusion
  • Associated with pulmonary osteoarthropathy, digital clubbing and hypoglycemia, which regress after tumor resection
  • Most likely fibroblastic and not mesothelial in origin, arising from submesothelial mesenchyme
  • Not associated with asbestos
  • May recur locally
  • May cause death due to extensive intrathoracic growth or if malignant
  • Surgical excision
Gross description
  • Arises from pleural surface by a pedicle
  • Solitary, well circumscribed, may be encapsulated
  • Composed of dense, gray-white fibrous tissue with firm, whorled cut surface (like uterine leiomyoma), large tumors may be cystic and hemorrhagic
Gross images

Images hosted on other servers:

Smooth rounded mass

Microscopic (histologic) description
  • Fibroblast-like cells with variable cellularity in collagenous, keloid-like stroma, reticulin fibers, hemangiopericytoma-like vessels
  • No / rare mitotic activity, no atypia
  • May entrap mesothelium or epithelium at periphery
  • May have focal or marked myxoid change with bland spindle cells in myxoid, vascularized stroma (Mod Pathol 1999;12:463)
Positive stains
Differential diagnosis