False-positive I-131 distribution caused by residual I-131 in the face mask
NQJ
2020 年 2 巻 p. 10-14
詳細
2020 年 2 巻 p. 10-14
A 70-year-old patient who underwent 131I radioiodine remnant ablation at our hospital after thyroid cancer had undergone total thyroidectomy and received 131 I scintillation 10 days after administration. A whole body image of 131I scintigraphy showed abnormal accumulation in the left precordial region. Although no metastasis was observed in the chest CT at the time of the first visit, the possibility of metastasis cannot be ruled out, and the abnormal accumulation disappeared in the additional SPECT image. The patient was wearing a face mask, and it was removed during the whole body scan and placed in a chest pocket. A radiological technologist who noticed the face mask removed it during SPECT imaging. When the mask was imaged with a scinti camera, an abnormal distribution thought to be 131I was observed. Since the epidemic of coronavirus infection, most people have started to wear face masks regularly. Even if the patient taking the 131I scintigraphy has the face mask removed, it is necessary to confirm the presence and location of the face mask before imaging.
