Liver Metastasis From Intracranial Hemangiopericytoma 8 Years After Initial Resection: Case Report.

Solitary fibrous tumor/hemangiopericytoma (SFT/HPC) is a rare intracranial tumor that arises from pericytes surrounding the blood vessels. Solitary fibrous tumor/hemangiopericytoma accounts for less than 1% of primary brain tumors and is classified as grades I, II, or III based on mitotic count. These tumors often masquerade as meningiomas. Histologically, SFT/HPC is vascular with high cellularity and often surrounded by connective tissue. Immunohistochemistry is positive for stat 6, vimentin, and CD34. Although aggressive surgical resection is the mainstay of treatment, close long-term follow-up is necessary as recurrence or extra cranial metastasis can present several years after resection.