Glomangiopericytoma, three cases in nine days; case reports and Brief review

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Glomangiopericytoma is a rare sinonasal tumor. We report three cases of this rare disease that presented in nine days to one subspecialty practice. Histochemical and DNA sequencing confirmed the diagnosis in each case. Endoscopic sinonasal surgery provided complete resection in each case. The occurrence of three cases to one practice within a 2-week timeframe may suggest GPC is under-recognized. Routine sequencing to detect CTNNB1 mutations and staining for smooth muscle actin of suspicious sinonasal tumors may increase the frequency of GPC detection.