| Summary: | In this study, we present a rare clinical case of haemangiopericytoma (HPC) of the supra/infratentorial cerebellar tentorium invading the transverse and straight sinuses and the torcular Herophili in a 31-year-old woman. The patient underwent total microsurgical tumour removal (World Health Organisation [WHO] grade II, International Classification of Diseases [ICD]: 8815/1) and received adjuvant radiation therapy on the site of the resected tumour bed. Despite treatment, HPC metastasised to the thoracic (Th7) and lumbar (L4) spinal regions after 18 months. The metastatic foci were removed, and Th6–Th9 transpedicular stabilisation was performed. The degree of anaplasia of the secondary foci increased to WHO grade III, ICD-8815/3.Cases of intracranial HSC spinal metastasis are rare and poorly understood. Moreover, the close connection between the cerebral venous outflow and paravertebral venous plexus and the absence of the valve system allows the metastatic embolus to remain in the vertebral body. Therefore, sinus wall invasion and metastasis into the sinus lumen is a risk factor for dissemination. Based on our experience, remote metastases can have a higher degree of malignancy, indicating the need for the early diagnosis of metastatic foci.
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