We report a case of a 47-year-old female known with metastatic papillary thyroid cancer. Her treatment history included total thyroidectomy and 3 previous radio ablations with a cumulative dose of 950 mCi of 131I. On follow-up, her thyroglobulin levels had demonstrated a rising trend (from 3789.0 to 4240.0 ug/L) despite a 123I whole-body scan demonstrating a reduction in tracer avid lesions. She was suspected of having radio-resistant disease. The patient underwent both 18F-FDG and 68Ga-PSMA PET/CT imaging with both scans demonstrating congruent lesions however with far greater intensity on the 68Ga-PSMA study.
Keywords: 18F-FDG; 68Ga-PSMA; Radioactive iodine refractory thyroid; Thyroid cancer.
© Korean Society of Nuclear Medicine 2019.