Abstract
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.
