Primary intraosseous glomus tumor is rare and may occur in the medullary cavity of bone. A 22-year-old woman with a one-year history of spontaneous and persistent sacral pain was found to have an intraosseous glomus tumor in this unusual location. Curettage was followed by complete relief from pain. This case of glomus tumor originating in the sacrum is thought to be the first reported in the world literature.
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Kobayashi et al. (1990) studied this question.