Positron emission tomography for detecting iodine-131 nonvisualized metastasis of well-differentiated thyroid carcinoma: Two case reports

1998 ◽  
Vol 21 (6) ◽  
pp. 392-398 ◽  
Author(s):  
Tien-Shang Huang ◽  
P. U. Chieng ◽  
C. C. Chang ◽  
R. F. Yen
Keyword(s):  
Positron Emission Tomography ◽  
Thyroid Carcinoma ◽  
Case Reports ◽  
Differentiated Thyroid Carcinoma ◽  
Emission Tomography ◽  
Positron Emission ◽  
Iodine 131 ◽  
Well Differentiated

scholarly journals Recombinant Human Thyrotropin Stimulation of Fluoro-d-Glucose Positron Emission Tomography Uptake in Well-Differentiated Thyroid Carcinoma

2004 ◽  
Vol 89 (1) ◽  
pp. 91-95 ◽  
Author(s):  
Bennett B. Chin ◽  
Pavni Patel ◽  
Christian Cohade ◽  
Marge Ewertz ◽  
Richard Wahl ◽  
...  
Keyword(s):  
Positron Emission Tomography ◽  
Thyroid Carcinoma ◽  
Fdg Pet ◽  
Residual Disease ◽  
Differentiated Thyroid Carcinoma ◽  
Emission Tomography ◽  
Tsh Suppression ◽  
Positron Emission ◽  
Well Differentiated ◽  
Recombinant Human Thyrotropin

TSH stimulates thyrocyte metabolism, glucose transport, and glycolysis. 2-Deoxy-2-[18F]fluoro-d-glucose (FDG) is a glucose analog used in positron emission tomography (PET) to detect occult well-differentiated thyroid carcinoma. The objective of this study was to examine the effects of recombinant human TSH (rTSH) on FDG PET uptake in patients with residual or recurrent disease. Seven patients with well-differentiated thyroid carcinoma, negative 131-I scintigraphy, and biochemical evidence of residual disease were randomized and prospectively studied with FDG PET both on thyroid hormone suppression and rTSH stimulation within 1 wk. All lesions seen on the TSH suppression scans were seen on the rTSH stimulation studies. rTSH stimulation studies identified four additional lesions not seen on TSH suppression. One patient was positive on rTSH stimulation alone. The mean (2.54 ± 0.72 vs. 1.79 ± 0.88) and maximum (2.49 ± 0.95 vs. 1.74 ± 0.81) lesion to background ratios were significantly higher with rTSH stimulation, compared with TSH suppression (P = 0.02 for both). rTSH stimulation improves the detectability of occult thyroid metastases with FDG PET, compared with scans performed on TSH suppression.

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