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Clinical and Experimental Obstetrics & Gynecology  2020, Vol. 47 Issue (2): 312-314    DOI: 10.31083/j.ceog.2020.02.5049
Case Report Previous articles | Next articles
Successful laparoscopic tumorectomy of struma ovarii diagnosed preoperatively
H. Morita1, *(), Y. Yamasaki1, S. Sugino1, H. Koh1, N. Kojima1, K. Kitajima2, T. Yamazaki3, K. Takeuchi4
1Department of Obstetrics and Gynecology, Rokko Island Konan Hospital, Kobe, Japan
2Department of Radiology, Hyogo Medical College, Nishinomiya, Japan
3Department of Diagnostic Pathology, Konan Hospital, Kobe, Japan
4Department of Obstetrics and Gynecology, Kobe Medical Center, Kobe, Japan
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Introduction: Struma ovarii is rare ovarian tumor. Almost 95% of it is indicated as the benign tumor. Therefore, it is important to be diagnosed preoperatively. A case that is diagnosed successfully as a struma ovarii preoperatively, is presented. Case Report: A 36-year-old Japanese woman G1P1, with no family history nor past history, was referred to this hospital for the treatment of an ovarian tumor, because followed up ovarian tumor gradually became enlarged. Regarding the patient’s laboratory data, no tumor marker was elevated. Thyroid function was within normal range. Ultrasound study demonstrated that the tumor was a multilocular mass with solid part. Pelvic MRI indicated stained glass appearance. Although there was a possibility of mucinous malignant tumor as a differential diagnosis, the authors mainly diagnosed it preoperatively as a struma ovarii. Laparoscopic right ovarian tumorectomy was performed and the histological examination revealed as a struma ovarii without malignancy. Conclusions: When the ovarian tumor presents a stainedglass appearance, it is important to diagnose carfeully keeping struma ovarii in mind as a differntial diagnosis.

Key words:  Struma ovarii      Laparoscopic operation      Preoperative diagnosis      Magnetic resonance imaging     
Published:  15 April 2020     
*Corresponding Author(s):  H. Morita     E-mail:

Cite this article: 

H. Morita, Y. Yamasaki, S. Sugino, H. Koh, N. Kojima, K. Kitajima, T. Yamazaki, K. Takeuchi. Successful laparoscopic tumorectomy of struma ovarii diagnosed preoperatively. Clinical and Experimental Obstetrics & Gynecology, 2020, 47(2): 312-314.

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Figure 1.  — Transvaginal ultrasound examination of the case: several cysts can be seeen beside the solid part in the ovarian mass.

Table 1  — Laboratory data of the patient’s first visit.
CEA 1.2 ng/ml TSH 1.144 μU/ml
SCC 0.8 ng/ml Free T3 2.75 pg/ml
CA-125 16.0 U/ml Free T4 1.03 ng/ml
CA19-9 21.1 U/ml
Figure 2.  — Pelvic MRI of the case. A) T1WI. B) T2WI. C) Gd- Enhanced T1WI: pelvic MRI demonstrates the multilobular cystic tumor with stained glass appearance. The solid part and thickened septi of the tumor show low intensity on T2WI which is rapidly and strongly enhanced.

Figure 3.  — Laparoscopic findings: a small amount of ascites is observed. Right ovary is as large as 6 cm and adheres to retroperitoneum. A) Uterus (U) and left ovary. B) Uterus (U) and right ovary.

Figure 4.  — Resected right ovarian tumor.

Figure 5.  — Histological examination revealed as a struma ovarii without malignancy. A) Low magnification. B) High magnification.

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