Kidney tumor - Adult malignancies
Other neoplasms - Adult or adult / child

Author: Sean Williamson, M.D. (see Authors page)

Revised: 8 February 2017, last major update June 2012

Copyright: (c) 2003-2017,, Inc.

PubMed Search: Hemangiopericytoma kidney

Cite this page: Hemangiopericytoma. website. Accessed March 24th, 2018.
Definition / general
  • Rare; < 50 cases reported
  • May arise in perirenal tissues or renal capsule with secondary invasion of kidney
  • Often older patients; may be associated with hypoglycemia
Case reports
Gross description
  • Large circumscribed tumor
Gross images

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Well circumscribed tumor

Microscopic (histologic) description
  • Rich network of branching vessels with staghorn configuration, lined by single layer of endothelium, surrounded by haphazard pattern of round / oval tumor cells with indistinct cell borders
Microscopic (histologic) images

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H&E and silver stain

Thin walled, staghorn vascular spaces (fig. 4)

Cytology description
  • Cellular, single and tightly packed clusters of oval to spindled cells aggregated around branched capillaries
  • Usually basement membrane material
  • Nuclei are uniform and oval with finely granular chromatin and inconspicuous nucleoli
  • No mitotic figures, no necrosis (Cancer 1999;87:190)
Cytology images

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Irregular fragments of tissue (fig. 1)

Uniform oval or spindled cells (fig. 2)

Metachromatic basement membrane material (fig. 3)