Surgical resection of sinonasal hemangiopericytoma involving anterior skull base: case reports and literature review

Hemangiopericytomas are soft tissue tumors composed of pericytic cells that are characterized by their, "staghorn" vascular branching and their variable clinical presentation. Fifteen to 25% of all HPC occur in the head and neck, with only 5% found in the nose or paranasal sinuses. Sinonasal hemangiopericytoma (SNHPC) is considered distinct from its soft tissue counterpart – the former showing a more uniform cellular organization, has convincing pericytic differentiation and is associated with a far better prognosis.

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