Primary Malignant Hemangiopericytoma

**Semantic type:** Neoplastic Process

**Definition:** A rare malignant mesenchymal neoplasm that is believed to have its origin in smooth muscle derived pericytes without evidence of metastases.

**Synonyms:** - Malignant Hemangiopericytoma Nonmetastatic - Non-Metastatic Malignant Hemangiopericytoma