An Invasive Solitary Fibrous Tumor/Hemangiopericytoma Originating From the Falx: A Case Report.

Intracranial solitary fibrous tumors (SFTs) and hemangiopericytomas (HPCs) are rare, aggressive tumors typically found along the dural sinuses. Despite their aggressive nature, complete surgical resection remains the most significant factor in reducing recurrence and improving survival. Here, we present the case of a 32-year-old male patient who presented with a new-onset headache and vertigo. Magnetic resonance imaging revealed a 50×37 mm left occipital mass originating from the falx and extending into the tentorium, with heterogeneous enhancement and compression/invasion of the left transverse sinus. Total resection was accomplished using microsurgical techniques, and histopathological analysis confirmed SFT/HPC, classified as WHO Grade II. Given the complete resection, including the venous sinus involvement, adjuvant radiotherapy was deemed unnecessary by the multidisciplinary committee. At the latest follow-up, five years post surgery, the patient showed no residual tumor or recurrence, with a reported overall well-being. Early detection and aggressive management through total resection can significantly improve survival and prognosis in patients with SFTs/HPCs.