hemangiopericytoma

Introduction

probably overlaps with solitary fibrous tumor, one time considered pericytic neoplasm.

Microscopic pathology

• prominant thin walled branching vascular pattern, often staghorn configuration
• tumor cells closely packed,
• spindle shaped to round, uniform
• small amounts of cytoplasm, indistinct margins
• small bland vesicular nuclei
• cellular areas resembling solitary fibrous tumor
• differs from solitary fibrous tumor in lack of
  • stromal hyalinization
  • varying cellularity
• high mitotic rate

Immunophenotype

• CD34 +
• CD99 +
• actin -
• desmin -

Clinical manifestations

• slowly growing mass

More general terms

• intermediate grade fibroblastic/myofibroblastic neoplasm

More specific terms

• hemangiopericytoma of meninges

Patient information

hemangiopericytoma patient information