PMC7067131_01
Diagnostic 123I whole body scan (a) and axial fused single-photon emission computed tomography/computed tomography (b) demonstrated focal uptake in the thyroid bed (arrow) with no evidence of cervical or distant metastases. Posttherapy 131I planar imaging (c) and axial fused single-photon emission computed tomography/computed tomography (d) demonstrated multiple foci of uptake in the neck compatible with nodal metastases (arrow)
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F1
Because of a history of depression, the patient was prepared for RAI therapy by rhTSH. 123I scan [Figure 1a and b] demonstrated focal uptake in the thyroid bed with no evidence of cervical or distant metastases and an uptake of 0.6%. However, posttherapy 131I imaging [Figure 1c and d] demonstrated multiple areas of neck uptake consistent with cervical nodal metastases but no distant metastases.
Approximately 1 year after initial radioactive iodine therapy, diagnostic 123I anterior (a) and posterior (b) images demonstrated two subtle foci of uptake at the left base of neck with faint uptake in the lower thorax but no definitive distant metastatic disease
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F2
Pretherapy 123I scan [Figure 2] demonstrated subtle uptake in the neck with faint uptake in the lower thorax but no definitive distant metastatic disease.
Posttherapy 131I whole body scan (a) and fused axial single-photon emission computed tomography-computed tomography through the thorax (b) demonstrated diffuse bilateral pulmonary uptake in addition to multifocal uptake in the neck. A noncontrast chest computed tomography performed at the time for further evaluation (c) demonstrated no correlate to the diffuse pulmonary 131I uptake
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F3
Posttherapy 131I scan [Figure 3] demonstrated diffuse bilateral pulmonary uptake in addition to multifocal uptake in the neck.