PMC8200661_01
(A, B) panels images showed intense radioiodine uptake in thyroid bed in the neck and unexpected uptake in the left side of the pelvic cavity. (C-E) Axial tomography images demonstrated the unexpected uptake corresponded to a ovarian cyst of approximately 3.2 x 2.4 cm in size. (F) The pelvic ultrasonography showed a 4.3 x 4.0 cm liquid area with internal separation in the left ovary. (G) Pathologic finding (hematoxylin and eosin staining x40) showed a simple ovarian cyst.
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Figure 1A , anterior view;  Figure 1B , posterior view) performed 3 days after I-131 administration revealed intense radioiodine uptake in thyroid bed in the neck and unexpected uptake in the left side of the pelvic cavity. Further SPECT/CT fused imaging was performed on the symbia The axial images ( Figure 1C , SPECT;  Figure 1D , CT; and  Figure 1E , fusion) demonstrated the unexpected uptake corresponded to a cystic low-density lesion of approximately 3.2 x 2.4 cm in the left adnexa region. Figure 1F ). Two weeks later, laparoscopic bilateral adnexectomy was performed under general anesthesia and a 5-cm mass of the left adnexectomy was found intraoperatively. Finally pathologic finding showed a simple ovarian cyst ( Figure 1G ). Three days after surgery, the nonstimulated Tg level immediately decreased to 143 ng/ml from stimulated state (11488 ng/ml).
Excepting for the physiological retention of stomach (black arrows) and bladder (red arrow), no radioactive uptake was observed in the neck and pelvic cavity on the diagnostic I-131-WBS.
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After 1 day of administration of 185 MBq (5 mCi) of I-131, excepting for the physiological retention of stomach (black arrows) and bladder (red arrow), no radioactive uptake was observed in the neck and pelvic cavity on the diagnostic I-131-WBS ( Figure 2 ).