A 71-year-old woman presented with a 2-month history of progressive exophthalmos. Magnetic
resonance imaging revealed a tumor occupying the right frontal sinus that compressed the right orbit
and eye ball. The tumor was resected through a right frontal craniotomy. The pathologic diagnosis
was leiomyoma and similar to the histologic diagnosis of a uterine leiomyoma resected 4 years earlier.
We suggest that this rare sinonasal leiomyoma was a benign metastasizing leiomyoma from the uterus
to the nasal sinus.
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