What is "hemangiopericytoma"

n. A sarcoma of the soft tissue that originates in the pericytes in the walls of capillary.

A hemangiopericytoma (HPC) is a type of soft tissue 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.