A patient, a female in her 70s, underwent total thyroidectomy for thyroid carcinoma and was referred to our hospital seven months later for Iodine-131 (I-131) therapy to ablate the remaining thyroid tissue. The patient received 2.55 GBq of I-131 and single photon emission computed tomography/computed tomography was performed on Day 11. This revealed irregular and heterogeneous abnormal uptake in the pelvis. Ultrasonography revealed no abnormalities in the uterus, but a multilocular mass measuring approximately 12 cm was found in the left ovary. Blood tests revealed an elevated carbohydrate antigen 19-9 level of 13.7 U/mL. The patient underwent simple abdominal total hysterectomy, bilateral adnexectomy, and partial omentectomy. Histopathological examination confirmed a diagnosis of ovarian mucinous borderline tumor. No thyroid tissue was detected.

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A woman in her 70s underwent total thyroidectomy for thyroid cancer. Three years later, cervical lymph node metastasis appeared. Following the removal of the lymph nodes, she was referred to our hospital for iodine-131 remnant thyroid ablation. Ten days after the administration of 3.33 GBq of I-131, an I-131 SPECT/CT scan was performed. A very strong I-131 abnormal distribution was observed in the right nasal vestibule. CT imaging revealed a soft tissue mass in the same area. Metastasis was suspected due to the strong abnormal accumulation, but there had been no change in size on CT images over the past about four years. Fine-needle aspiration cytology was performed. The aspirate was liquid with no atypical cells observed, and thyroglobulin was also absent, thus ruling out metastasis. The lesion was diagnosed as a nasolabial cyst.

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