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F-18 FDG PET scan findings in patients with Loeffler's syndrome

 Soo Yoon Chung  ;  Jae Hoon Lee  ;  Tae Hoon Kim  ;  Mijin Yun  ;  Tae Sung Kim  ;  Sang Jin Kim  ;  Hyung Joong Kim  ;  Moonsun Pai  ;  Jong Doo Lee  ;  Young Hoon Ryu 
 CLINICAL NUCLEAR MEDICINE, Vol.34(9) : 570-575, 2009 
Journal Title
Issue Date
Adult ; Aged ; Diagnosis, Differential ; Fluorodeoxyglucose F18* ; Humans ; Lung Neoplasms/diagnostic imaging ; Male ; Middle Aged ; Positron-Emission Tomography ; Pulmonary Eosinophilia/diagnostic imaging* ; Tomography, X-Ray Computed
Loeffler's syndrome ; F-18 FDG PET ; false positive ; lung cancer ; chest CT
PURPOSE: : This study aimed to evaluate the F-2-fluoro-2-deoxyglucose positron emission tomography (F-18 FDG PET) findings of Loeffler's syndrome and to determine differential features between lung malignancy and Loeffler's syndrome.

MATERIALS AND METHODS: : F-18 FDG PET and low-dose chest CT scans were performed to screen for lung cancer. Eleven patients who showed pulmonary lesions on CT scan with peripheral blood eosinophilia were included. PET scans were evaluated by mean and maximum standardized uptake values (SUVs) of abnormalities. CT findings were reviewed and correlated with the PET findings. In all patients, follow-up CT scans and PET scans were done from 1 to 4 weeks after the initial study.

RESULTS: : F-18 FDG PET scans identified metabolically active lesions in 9 of 11 patients. Maximum SUVs ranged from 2.8 to 10.6, and mean SUVs ranged from 2.2 to 7.2. The other 2 patients had maximum SUVs of 1.3 and 2.2. Follow-up PET scans showed a decreased degree of initially noted FDG uptakes or migration of the lesion. The CT scan showed nodular lesions with a peripheral halo (n = 6), ground-glass attenuation (n = 4), and consolidation (n = 1). Follow-up CT scans revealed decreased size and extent of the initial lesions in 7 patients and migration in 2 patients. The other 2, who had relatively mild F-18 FDG uptakes, showed complete radiographic resolution of the lesions.

CONCLUSIONS: : A single F-18 FDG PET study is not useful in differentiating benign and malignancy in patients with Loeffler's syndrome. Correlation and follow-up of PET and CT scan for the identification of abnormalities and their changes can be helpful for the differentiation between lung malignancy and Loeffler's syndrome
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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 Radiology (영상의학교실) > 1. Journal Papers
Yonsei Authors
Kim, Sang Jin(김상진)
Kim, Tae Sung(김태성)
Kim, Tae Hoon(김태훈) ORCID logo https://orcid.org/0000-0003-3598-2529
Kim, Hyung Jung(김형중) ORCID logo https://orcid.org/0000-0003-2498-0683
Ryu, Young Hoon(유영훈) ORCID logo https://orcid.org/0000-0002-9000-5563
Yun, Mi Jin(윤미진) ORCID logo https://orcid.org/0000-0002-1712-163X
Lee, Jae Hoon(이재훈) ORCID logo https://orcid.org/0000-0002-9898-9886
Lee, Jong Doo(이종두)
Chung, Soo Yoon(정수윤) ORCID logo https://orcid.org/0000-0002-6751-7288
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