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57 year old female

Hemangiopericytoma

Rare vascular tumor

Arises from pericapillary cells or pericytes of Zimmerman

Develops mainly in lower extremities, retroperitoneum or pelvis

Rarely occurs meninges, larynx, thorax, bone or spleen

Hemangiopericytoma

<1% of all primary CNS neoplasms

Peak Incidence fourth and fifth decades

Slight male predominance

High rates of Local recurrence, often > 4cm at presentation

~20% metastasize extracranially to bone, and lung, and liver

Imaging Characteristics

Usually dural based/ extra axial

Lobulated contour with flow voids indicating that it is a hypervascular mass

Usually do not calcify or cause hyperostosis of adjacent bone but can erode

CT-Hyperdense

MRI-isointense on T1; variable on T2

Intense enhancement post contrast

Differential

Primarily meningioma; often indistinguishable

solitary fibrous tumor

sarcoma

mestastasis

malignant lymphoma

TX: surgery; radiation