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WHO Classification of Tumours
Haemangiopericytoma
Prostate gland


Definition

A mesenchymal tumor composed of dilated vascular spaces (some with a staghorn or bifed shape) throughout. The individual tumor cells are surrounded by reticulin everywhere, are negative for muscle, nerve sheath, and epithelial markers, and are positive for CD34 and CD99. The biologic behavior of hemangiopericytoma cannot always be predicted from the morphologic features. The 5- and 10-year survival rates of malignant hemangiopericytomas have been reported to be 40% and 29% respectively
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Mills SE, Carter D, Greenson JK, Oberman HA, Reuter VE
Sternberg's Diagnostic Surgical Pathology
4th Edition
Lippincott, Williams & Wilkins: Philadelphia 2004



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Hemangiopericytomas closely resemble cellular areas of solitary fibrous tumour (SFT) and and are closely related to, if not synonymous with, SFT

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Fletcher CDM, Unni KK, Mertens F (Eds.)
World Health Organization Classification of Tumours. Pathology and Genetics of Tumours of Soft Tissue and Bone.
3rd Edition
IARC Press: Lyon 2002



. Lesions formerly known as infantile HPC fall within the spectrum of infantile myofibromatosis .