Myofibromas are rare, benign tumors of myofibroblasts. Their occurrence in adults, involving bone outside of the head and neck, is especially uncommon. The authors report the case of a 34-year-old woman who presented with left-sided brachialgia. Magnetic resonance imaging identified an expansile soft-tissue lesion of the C6-7 facet joint. En bloc resection via a left posterior midline approach was undertaken. Histopathological analysis confirmed the lesion to be a myofibroma. Brachialgia resolved following surgery and there is no evidence of recurrence at 20 months follow-up. Myofibroma is a rare cause of primary soft-tissue tumor of the spine. Surgical excision remains the mainstay of treatment.
Keywords: SMA = smooth muscle actin; brachialgia; cervical spine; myofibroma; oncology.