2022 年 4 巻 p. 1-4
A woman patient in her 40s with differentiated thyroid cancer who had undergone total thyroidectomy underwent 131I radioiodine remnant ablation by administering 2.96 GBq of 131I at our hospital. 131I SPECT/CT images 10 days after administration showed abnormal accumulation of 131I in the left facet joint of the second lumbar vertebral bone. This abnormal uptake was considered to be due to bone metastasis of thyroid cancer, and surgical resection was performed. Histopathologically, no thyroid cancer cell was observed, but proliferations of small megakaryocytes were observed, which revealed myelodysplastic syndrome (MDS). To the best of our knowledge, there have been no reports of abnormal 131I accumulation in MDS.
