Other tumors
Malignant solitary fibrous tumors

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

Revised: 27 March 2018, last major update December 2013

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

PubMed Search: Malignant solitary fibrous tumor[TI] pleura

See also: Solitary fibrous tumor
Page views in 2018: 739
Page views in 2019 to date: 824
Cite this page: Pernick, N. Malignant solitary fibrous tumors. website. Accessed August 22nd, 2019.
Definition / general
  • Very rare
Case reports
Microscopic (histologic) description
  • Fascicles or patternless pattern of spindled or plump cells in dense collagenous stroma
  • Increased cellularity, marked nuclear atypia, prominent necrosis, high mitotic activity
Microscopic (histologic) images

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Case of the Week #358:

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Storiform pattern of spindle cells with mitotic figures

Mitotic activity

Haphazard growth pattern


Cytology images

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Cytology of pleural effusion

Cell block of pleural effusion

Positive stains
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