Résumé
Objective To analyze the value of PET/CT for diagnosis of recurrence and metastasis of dif-ferentiated thyroid carcinoma ( DTC) .Methods 65 patients with DTC in Thyroid Surgery Department of the First Affiliated Hospital of Zhengzhou University from Dec .2005 to Jan.2015 were collected.Based on the values of serum thyroglobulin(Tg),the patients were divided into 2 groups.29 cases with positive Tg were the observation group and 36 cases with negative Tg were the control group .All patients underwent PET/CT examination one year after surgery.Patients with positive findings from image studies underwent surgical excision and postoperative pathological diagnosis .Clinical data of the 2 groups were then summarized and discussed .Results There was no significant difference on the general conditions between the 2 groups(P>0.05).Tg values were statistically dif-ferent 6 months and 1 year after surgery between the 2 groups(P0.05).9 cases in the observation group and 1 case in the control group had positive findings on image study .All the cases with cervical lymph nodes presented as high uptake of 18 F-FDG.All patients who had positive findings on PET/CT underwent surgical removal of the abnormal lymph nodes which confirmed by pathology as lymph node metastasis .Conclusion PET/CT is very important for diagno-sis of recurrence and metastasis on Tg(Tg>2μg/L)positive,131I Dx-WBS imaging and US negative patients.