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Comparison of 18F-FDG, 131I-Na, and 201Tl in Diagnosis of Recurrent or Metastatic Thyroid Carcinoma

Tohru Shiga, Eriko Tsukamoto, Kunihiro Nakada, Koichi Morita, Takashi Kato, Megumi Mabuchi, Keiichiro Yoshinaga, Chietugu Katoh, Yuji Kuge and Nagara Tamaki

Departments of Nuclear Medicine and Tracer Kinetics, Hokkaido University School of Medicine, Sapporo, Japan



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  		FIGURE 1. One-centimeter-diameter regions of interest drawn over tumors (white circle) and contralateral region (black circle) on spot images from 201Tl scintigraphy (A) and on 5-mm-thick axial images from FDG PET (B).

 


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  		FIGURE 2. A 46-y-old woman with thyroid papillary cancer with metastases to neck lymph node, mediastinal lymph node, and pelvic bone. (A) 131I scans show focal uptakes in neck and mediastinum and strong uptake in pelvic bone. However, FDG PET (B) and 201Tl (C) scans show no definite abnormality. Thyroglobulin level = 291.8 ng/mL; thyroglobulin antibody level = 5.85 U/mL; TSH level = 145 µU/mL.

 


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  		FIGURE 3. A 55-y-old man with thyroid papillary cancer with metastasis to mediastinal lymph node. (A) 131I scans show no definite abnormality. However, FDG PET (B) and 201Tl (C) scans show mediastinal lymph node metastasis. Thyroglobulin level = 1,494 ng/mL; thyroglobulin antibody level = 0.32 U/mL; TSH level = 97 µU/mL.

 


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  		FIGURE 4. Relationship between TBRs of 201Tl and FDG PET (TBR of FDG = 6.6 x TBR of 201Tl - 5.1; r = 0.69; P < 0.05; n = 15).

 




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