Ear Nose Throat J. 2004 Dec;83(12):807.
FIRST PARAGRAPH: A glomangiopericytoma (sinonasal-type hemangio-pericytoma) is a tumor believed to derive from perivascular modified smooth-muscle cells. Its origin is similar to that of a glomus tumor (not to be confused with glomus jugulare, which is a different neoplasm) but distinctly different from soft-tissue hemangiopericytoma. There is a very slight female preponderance, and the tumors peak incidence occurs during the seventh decade of life. Most affected patients experience nasal obstruction and epistaxis along with a wide array of other nonspecific findings that are generally present for less than 1 year. Glomangiopericytomas have a predilection for the nasal cavity and paranasal sinuses, where they grow as polypoid masses. Their average size is approximately 3 cm, and they are often mistaken clinically for inflammatory polyps.
PubMed ID: 15724732
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