Nasal hemangiopericytoma successfully treated with a combination of rIL-2 and extranasal approaches

Hemangiopericytomas (HPCs) are uncommon vascular tumors originating from extracapillary cells called pericytes, and rarely occur in the nose or paranasal sinuses. We treated a 57-year-old man with nasal HPC who presented with nasal obstruction and hemorrhage. Nasal endoscopy showed a readily bleeding mass between the right nasal septum and inferior turbinate. Enhanced CT revealed a heterogeneous mass lesion with an enhancement effect that filled the right nasal cavity. A biopsy specimen was proved to exhibit a HPC histopathology. Recombinant interleukin-2 (rIL-2) was administered with a measurement of natural killer cell (NK cell) activity. Afterwards, wide excision with an extranasal approach was performed. The use of rIL-2 caused not only increased NK cell activity but also a reduction in the tumor size. With a combination of rIL-2 and wide excision with extranasal approaches, no local recurrence or metastasis has occurred over the last 4 years.