Spinal metastasis from struma ovarii: Case report and review of the literature

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Abstract

Struma ovarii is a rare tumor that is defined as an ovarian teratoma with a thyroid tissue component exceeding 50%. Most of these tumors are benign, with malignant struma ovarii occurring in <1% of patients. Here, we describe the case of a 49-year-old female patient with malignant struma ovarii who developed thoracic spine metastasis. She had undergone an oophorectomy and was diagnosed with struma ovarii 10 years previously. She had remained recurrence-free thereafter. At 49 years of age, she developed low back pain and was admitted to our hospital for evaluation of a spinal tumor at the Th7 level. An emergency bone biopsy led to a diagnosis of metastasis from malignant struma ovarii. External beam radiotherapy inhibited further tumor growth and there was no resulting muscle weakness. This is the first report of spinal metastasis occurring 10 years after resection of struma ovarii, indicating the need for long-term follow-up.

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Kobayashi, K., Imagama, S., Tsunekawa, S., Hosokawa, K., Watanabe, M., Ito, Z., … Ishiguro, N. (2015). Spinal metastasis from struma ovarii: Case report and review of the literature. Asian Spine Journal, 9(2), 281–285. https://doi.org/10.4184/asj.2015.9.2.281

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