title: Struma ovarii presenting with Hashimoto's thyroiditis: a case report.
abstract: BACKGROUND
  We report the case of a patient diagnosed with a struma ovarii with lymphocytic thyroiditis of her ectopic thyroid tissue. We believe that this case presents an unusual variation of a struma ovarii and a rare presentation of subclinical hyperthyroidism.
  
  
  METHODS
  A 17-year-old Caucasian female patient who had undergone an ovariectomy and been diagnosed with a struma ovarii was subsequently found to have persistent subclinical hyperthyroidism with a low radioiodine uptake. Abdominal magnetic resonance imaging and iodine-131 whole body scanning showed no residue or recurrence and a thyroid ultrasonography was normal. Laboratory and histopathological findings suggested Hashimoto's thyroiditis as the cause of the subclinical thyrotoxicosis, which had presumably started at the ectopic tissue.
  
  
  CONCLUSIONS
  Struma ovarii is a rare cause of thyrotoxicosis, and can be difficult to diagnose in the presence of co-existing thyroid disorders. In patients with a struma ovarii who have not undergone thyroidectomy, there is no common consensus on management in terms of residue, recurrence or metastasis. Autoimmune thyroiditis must be kept in mind for a differential diagnosis.
authors.affiliation: Department of Endocrinology and Metabolism, Ankara Diskapi Training and Research Hospital, 781/2 Sok, No:1 Altindag Caddesi, Yildirim Beyazit Mahallesi, 06115 Altindag- Ankara, Turkey. nujencolak@yahoo.com.
authors.forename: Nujen Colak
authors.initials: NC
authors.lastname: Bozkurt
authors.forename: Başak
authors.initials: B
authors.lastname: Karbek
authors.forename: Evrim Cakır
authors.initials: EC
authors.lastname: Ozkaya
authors.forename: Erman
authors.initials: E
authors.lastname: Cakal
authors.forename: Tuncay
authors.initials: T
authors.lastname: Delibaşi