Objective To evaluate the therapeutic effeet of transurethral non-contact laser in the bladder neck stricture. Methods Q-9000 laser generator was used.The Nd-YAG laser was located to the bladder neck by laser fiber(USA).The bladder neck was cut on the point of 12 and 6 in all 39 cases. Results The maximum urinary flow was increased from (8.2?2.4)ml/s to (16.5?3.2)ml/s after operation. Conclusions Transurethral non-contact laser is effective for the treatment of bladder neck stricture.

Objective To investigate the causes of urinary calculi recurrence following ESWL. Methods After constructing the animal model of urinary calculi,the sheep with stone were treated by ESWL and the treated kidney was checked with morphological studies. Results The renal pelvic membrane was initially damaged heavily,the injure being healed from 2 ～ 4 weeks.At the same time, there were some calculi particles embeded in the renal pelvic membrane. Conclusions The embeded calculi particles and the damage of the pelvic membrane were the main causes of calculi recurrence following ESWL.

Objective:To investigate the diagnostic value of synthetic MRI methods in the differentiation of benign and malignant breast lesions.Methods:Clinical and imaging data of 93 breast patients confirmed by pathology in the Second Affifiliated Hospital of Xi′an Jiaotong University from May 2019 to April 2020 were analyzed retrospectively. All patients underwent synthetic MRI technique, and the quantitative parameters of T 1, T 2, and proton density (PD) values were measured. Independent samples t-test and Wilcoxon test were used to compare the differences in clinical and imaging characteristics between the benign and malignant breast lesions. ROC curve was used for the comparison of the diagnostic efficacy of the quantitative parameters in differentiating malignant from benign breast lesions. Results:Of the 93 patients with breast lesions, 62 cases were malignant and 31 cases were benign. The quantitative T 2 values for benign and malignant lesions were 103 (93, 126)ms and 83 (77, 90)ms respectively, and the quantitative PD values were 87.7 (72.7, 96.7)pu and 73.5(63.3, 79.4)pu respectively. There were statistically significant differences between benign and malignant lesion( P<0.05). Taking quantitative T 2 values of 90.5 ms and PD values of 84.8 pu as the cut-off value, the area under the ROC curve in differentiating benign from malignant breast lesions were 0.87 and 0.75, accuracy values were 80.6% and 78.5%, specificity values were 87.1% and 54.8%, sensitivity values were 77.4% and 90.3% respectively. Conclusion:Synthetic MRI methods can be applied in the examination of breast lesions and has the potential to be an effective diagnostic method for the differential diagnosis between benign and malignant lesions of breast.