PMC6113955_01
(A) 99mTc thyroid scintigraphy shows no abnormal uptake to the thyroid; (B) 123I whole-body scintigraphy shows a low radioactive iodine uptake to the thyroid gland and a high iodine level in the left pelvic space.
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F1
Furthermore, thyroid ultrasonography showed no abnormal findings, and 99mTc thyroid scintigraphy showed no abnormal uptake to the thyroid (Figure 1A). The tumor was suspected to be an ovarian mature cystic teratoma by magnetic resonance imaging, and it was suspected to be functional for producing thyroid hormone. 123I whole-body scintigraphy showed a low radioactive iodine uptake to the thyroid gland, and a high iodine level was present in the left pelvic space (Figure 1B).
Thyroid function over 8 months. FT3 = free triiodothyronine; FT4 = free thyroxine; TSH = thyroid stimulating hormone.
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F2
After surgical resection of the struma ovarii, the patient became euthyroid (Figure 2).