Objective:To investigate and compare the efficacy and safety of unilateral axillary bilateral areola（UABA）approach and Da Vinci robotic surgery in the treatment of low-risk thyroid cancer with unilateral adenolotomy and unilateral central lymph node dissection.Methods:The clinical data of 124 patients with thyroid cancer who underwent unilateral adenolotomy plus unilateral central lymph node dissection through the UABA approach from January 2019 to December 2019 were retrospectively analyzed. They were divided into two groups according to different operation methods：61 cases（robot group）and 63 cases（endoscopic group）. SPSS 25.0 software was used for statistical analysis. Perioperative indicators were expressed as（mean ± standard）deviation，and t test was used. Age，tumor size and number of central lymph nodes were represented by M（QR），and Mann-Whitney U test was used. Gender，tumor location，number of transplanted parathyroid glands，postoperative hypocalcemia and transient hypoparathyroidism were expressed by frequency and percentage using χ2 test. P<0.05 was statistically significant.Results:The operative time and the number of parathyroid transplantation cases in the robot group were less than those in the endoscopic group（P<0.001）. The number of central lymph nodes in the robot group was significantly higher than that in the endoscopic group［8（6，12）vs. 6（3，8），P=0.021］. There was no significant difference in the number of metastatic lymph nodes and the incidence of postoperative complications between 2 groups（P > 0.05）.Conclusions:Unilateral lobotomy via UABA approach and robotic surgery plus single central region dissection are both safe and effective for low-risk thyroid cancer，and robotic surgery can better preserve parathyroid glands in situ.

Objective:To describe the detailed clinical, to analyze the detailed clinical features, Imaging Characteristics of PSP under multislice spiral computed tomography (MSCT), and 18F-fluorodeoxy glucose positron emission tomography (18F-FDG PET/CT) , in order to improve the preoperative diagnosis.Methods:A total of 55 patients with PSP confirmed by surgical pathology were included, 48 cases received CT plain scan, 33 cases received CT enhanced scan and 19 cases received 18F-FDGPET/CT imaging. The distribution, morphology, size, clinicoradiological signs and metabolic uptake results of lesions were further analyzed. the relationship between maximum standardized uptake value (SUVmax) and maximum diameter of lesions were observed.Results:Most patients had a single lesion (94.5%), smooth boundary (89%), and round or oval shape (85.5%), and the mean diameter was 25.6 mm. The mainCT signs included vessel marginal sign (45.5%), halo sign (12.7%), air crescent sign (16.4%) and calcification (41.8%). Delayed phase of Enhanced scanning tends to be continuous and homogeneous enhanced. Besides, The mean maximum standardized uptake value on FDG PET of 19 patients was (2.87±1.20). the maximum standardized uptake value (SUVmax) of 19 patients were significantly positively correlated with the maximum diameter of lesions (R=0.51, P<0.001).Conclusion:Imaging Characteristics of PSP in MSCT is special, such as vessel marginal sign, halo sign, air crescent sign and calcification. And the 18F-FDGPET/CT scan revealed hypometabolic FDG uptake in the patients with PSP, which may be related to the increased uptake of FDG. MSCT imaging signs and 18F-FDGPET/CT metabolic uptake provide a theoretical basis for the correct diagnosis of PSP.