Asian Spine J.  2015 Apr;9(2):281-285. 10.4184/asj.2015.9.2.281.

Spinal Metastasis from Struma Ovarii: Case Report and Review of the Literature

Affiliations
  • 1Department of Orthopaedic Surgery, Nagoya University Graduate School of Medicine, Nagoya, Japan. imagama@med.nagoya-u.ac.jp
  • 2Department of Endocrinology, Nagoya University Graduate School of Medicine, Nagoya, Japan.
  • 3Department of Endocrinology, Okazaki City Hospital, Okazaki, Japan.

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.

Keyword

Neoplasms; Struma ovarii; Spinal neoplasms; Thyroid; Recurrence

MeSH Terms

Biopsy
Diagnosis
Emergencies
Female
Humans
Low Back Pain
Middle Aged
Muscle Weakness
Neoplasm Metastasis*
Ovariectomy
Radiotherapy
Recurrence
Spinal Neoplasms
Spine
Struma Ovarii*
Teratoma
Thyroid Gland
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