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Pituitary 18F-FDG Uptake Correlates With Serum TSH Levels in Subjects With Diffuse Thyroid 18F-FDG Uptake

 Jeong, Yong Hyu  ;  Kim, Dongwoo  ;  Lee, Jeong Won  ;  Rhee, Yumie  ;  Nam, Kee-Hyun  ;  Yun, Mijin MD  ;  Kim, Chun Ki 
 CLINICAL NUCLEAR MEDICINE, Vol.40(8) : 632-636, 2015 
Journal Title
Issue Date
Adult ; Aged ; Aged, 80 and over ; Female ; Fluorodeoxyglucose F18/pharmacokinetics* ; Humans ; Male ; Middle Aged ; Multimodal Imaging ; Pituitary Gland/diagnostic imaging* ; Positron-Emission Tomography* ; Radiopharmaceuticals/pharmacokinetics* ; Thyroid Gland/diagnostic imaging* ; Thyrotropin/blood* ; Tomography, X-Ray Computed
diffuse uptake ; FDG ; PET/CT ; pituitary gland ; thyroid gland
PURPOSE: This study was to evaluate the relationship among FDG uptake in the pituitary gland (FDGp), FDG uptake in the thyroid gland (FDGt), and serum thyroid-stimulating hormone (TSH) levels in patients with diffuse FDGt incidentally noted on positron emission tomography/computed tomography (PET/CT). PATIENTS AND METHODS: We retrospectively reviewed FDG PET/CT scans of 2,945 subjects who underwent health screening. Of these, 44 subjects had diffuse FDGt and available thyroid function tests. FDGt and FDGp were correlated with serum TSH. FDGp in 44 paired control subjects without FDGt and 15 thyroid cancer patients undergoing thyroid hormone withdrawal were additionally measured, and compared with FDGp in the 44 subjects with FDGt divided into 3 groups according to serum TSH levels. RESULTS: In the 44 subjects, there was a strong correlation found between FDGp and TSH (P < 0.001, r = 0.618). As well, there were statistically significant differences in FDGp between the low, normal, and high TSH groups (P < 0.001). FDGp in the paired control subjects was not different from that in the normal TSH group (P = 0.384), and FDGp in the TSH-stimulated thyroid cancer patients was not different from that in the high TSH group (P = 0.463). CONCLUSION: We found a strong positive correlation between pituitary FDG uptake and serum TSH. Pituitary FDG uptake seems to hold an important clue to the functional status of the thyroid in subjects with diffuse thyroid FDG uptake. Furthermore, physiologic FDG uptake in the pituitary gland caused by hypothyroidism should not be confused with pathologic conditions such as macroadenoma or metastases.
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1. College of Medicine (의과대학) > Dept. of Internal Medicine (내과학교실) > 1. Journal Papers
1. College of Medicine (의과대학) > Dept. of Nuclear Medicine (핵의학교실) > 1. Journal Papers
1. College of Medicine (의과대학) > Dept. of Surgery (외과학교실) > 1. Journal Papers
Yonsei Authors
Nam, Kee Hyun(남기현) ORCID logo https://orcid.org/0000-0002-6852-1190
Yun, Mi Jin(윤미진) ORCID logo https://orcid.org/0000-0002-1712-163X
Rhee, Yumie(이유미) ORCID logo https://orcid.org/0000-0003-4227-5638
Lee, Jeong Won(이정원)
Jeong, Yong Hyu(정용휴) ORCID logo https://orcid.org/0000-0002-0198-0026
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