1 Intracranial Hemangiopericytoma Focally Recurrent to the Pelvis

A 42-year-old male with a history of recurrent intracranial hemangiopericytoma presented to the Emergency Depart-ment with urinary retention. Ensuing work-up revealed a 10-centimeter circumscribed pelvic mass that appeared ana-tomically distinct from the sacrum. This metastasis was found 10 years after the initial resection of his intracranial le-sion. An abdominal resection was performed, and the patient recovered uneventfully. Final pathology and staining findings were consistent with metastatic hemangiopericytoma. Hemangiopericytoma is a rare mesenchymal soft tissue neoplasm with potential for late local recurrence and metastasis. Here, we review the case and discuss the clinical rele-vance of narrowing the diagnosis to HPC or the growing umbrella of Solitary Fibrous Tumor (SFT). To our knowledge, this is the first report of intracranial HPC metastatic to the pelvis