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Hemangiopericytoma Pathology USMLE Step 1

A hemangiopericytoma is a type of softtissue sarcoma that originates in the pericytes in the walls of capillaries. When inside the nervous system, although not strictly a meningioma tumor, it is a meningeal tumor with a special aggressive behavior. It was first characterized in 1942.

Hemangiopericytomas are a type of rare tumor involving blood vessels and soft tissues.

Hemangiopericytomas often are painless masses and may not have any associated symptoms.

These hemangiopericytoma tumors can originate anywhere in the body where there are capillaries. The most common locations reported are the brain, lower extremities, pelvic area, head, and neck.

Hemangiopericytomas can be either benign (noncancerous) or malignant (cancerous). Malignant hemangiopericytomas can metastasize or spread to other areas in the body, primarily the lungs and bones.

Hemangiopericytomas can be located in the nasal cavity and paranasal sinuses. Though rare, their prognosis is better because they tend to be less aggressive and do not metastasize.
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