RESUMO
Objective To analyze the misdiagnosis reasons of lung lesions detected by 18 F-FDG PET-CT .Methods Twenty-seven cases of misdiagnosed lung lesions were retrospectively analyzed ,including 14 cases of benign lesions misdiagnosed as lung cancer and 13 cases of lung cancer misdiagnosed as benign lesion ,which were analyzed from the aspects of the CT signs ,lesion size , SUVmax value ,SUVmax value at two-phase PET and clinicopathology .Results The CT signs in the false positive group were mainly manifested as clear border ,uniform density and so on ,while which in the false negative group were mainly manifested as lob-ulation sign ,spicule sign ,pleural indentation sign ,and so on .The mean maximum lesion diameter in the false positive group was (3 .23 ± 0 .59)cm ,which in the false negative group was (1 .67 ± 0 .27)cm .The SUVmax mean value in the false positive group was 10 .49 ,which in the false negative group was 5 .49 .The mean increasing rate of the SUVmax by dual-phase PET-CT in the false positive group was 38 .4% ,which in the false negative group was 17 .9% .The clinicopathologic inflammatory lesion was easy to be misdiagnosed as lung cancer ,high differentiated lung cancer and carcinoid were easy to be misdiagnosed as benign lesion .Conclusion Judging the malignant or benign lung lesions should consult in the patient′s clinical data and strengthen the comprehensice appli-cation of CT signs ,lesion size and SUVmax value .
RESUMO
Objective To observe the effect of the first iodine-131 ablation of thyroid remnants in pa-tients with differentiated thyroid cancer (DTC) and discuss factors that may be influential in the treatment. Meth-ods All DTC patients confirmed by pathology received iodine-131 therapy after necessary preparation. Accord-ing different operation procedures, time interval between operation and iodine-131 treatment and dose of iodine - 131, the patients were divided into different groups. Therapy effects were observed in different groups. Results Ablation successful rate was 88.5% in total thyroidectomy group, compared with 44.4% in subtotal thyroidecto-my group. 92.7% ablation rate was seen in the group of I-2 months time interval between operation and iodine - 131 treatment, while in the group of over 1 year time interval, only 50% ablationrate was achieved. Ablation successful rate was 47.6% in the group of low dose of iodine-131 (2.96GBq), compared with 82.8% in the high dose group (4.44GBq). Conclusions Total thyroidectomy and cervical lymph nodes dissection should be recommended for the patients with DTC. The better interval time between operation and iodine-131 ablation thy-roid remnants is 1～2 months. The high dose of iodine-131 shows better result than low dose of iodine-131 treatment.
