General
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• Most common site is pelvis
• Benign or malignant behavior

Case reports
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• Patient with tumor of sternum (Arch Pathol Lab Med 1991;115:242)

Micro description
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• Uniform round/oval cells arranged around deformed vascular spaces

Micro images
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Spindle cells arranged around large, irregularly shaped vessels

Reticulin surrounds each tumor cell (reticulin stain)

Differential diagnosis
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• Metastatic hemangiopericytoma from meninges

Additional references
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• Am J Surg Pathol 2004;28:1

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