Objective To explore the predictive value of the nomogram model based on multimodal MRI signs for adverse pregnancy outcomes in placenta accreta spectrum disorders(PAS).Methods The clinical and MRI data of 60 patients with PAS diagnosed by surgery and/or pathology were collected.Multivariate logistic regression was used to analyze the independent risk factors of adverse pregnancy outcomes in PAS.According to the results of multivariate logistic regression analysis,the nomogram prediction model of adverse pregnancy outcomes in PAS was constructed.Results Placenta/uterine protrusion[odds ratio(OR)=6.717,P=0.015],abnormal blood vessels in the placenta(OR=7.929,P=0.009),and diffusion weighted imaging(DWI)placental spike/nodular protrusion into the muscular layer(OR=12.134,P=0.003)were independent risk factors for adverse pregnancy outcomes in PAS.Based on the results,a nomogram prediction model was constructed.The area under the curve(AUC)of the model for predicting adverse pregnancy outcomes of PAS was 0.907,with a sensitivity of 0.906 and a specificity of 0.821.Conclusion The nomogram model constructed based on multimodal MRI signs has certain value in predicting adverse pregnancy outcomes of PAS.

Objective To explore the value of multi-parameter MRI in predicting the Ki-67 expression level in nasopharyngeal carcinoma(NPC).Methods The clinical and MRI data of 63 patients with pathologically confirmed NPC were prospectively collected.All patients underwent routine plain and enhanced nasopharyngeal MRI,diffusion weighted imaging(DWI),and arterial spin labeling(ASL)scans before treatment.Multivariate logistic regression analysis was used to identify the independent risk factors for the Ki-67 expression level.Results The degree of enhancement,the maximum blood flow(BFmax),and the minimum apparent diffusion coefficient(ADCmin)were independent risk factors for the Ki-67 expression level in NPC patients.The area under the curve(AUC)of the prediction model established based on these three factors was 0.920,with a sensitivity of 0.792 and a specificity of 0.897,respectively.Conclusion Multi-parameter MRI based on conventional enhancement,ASL,and DWI can effectively predict the Ki-67 expression level in NPC patients.

Objective To explore the value of three-dimensional pseudo-continuous arterial spin labeling(3D pCASL)and diffu-sion weighted imaging(DWI)in the differential diagnosis of stage T1 nasopharyngeal carcinoma(NPCT1)and lymphoid hyperplasia(LH).Methods A total of 21 patients with pathological diagnosis and clinical stage of NPCT1(NPCT1 group)and 50 patients with pathological diagnosis of LH(LH group)were selected.All patients underwent nasopharyngeal 3D pCASL and DWI scans before treatment.The blood flow(BF)values of all lesions[minimum BF(BFmin),mean BF(BFmean),maximum BF(BFmax)],and the rel-ative blood flow(rBF)values of the ratio of lesions to lateral pterygoid muscle at the same plane[minimum rBF(rBFmin),mean rBF(rBFmean),maximum rBF(rBFmax)],the apparent diffusion coefficient(ADC)values[minimum ADC(ADCmin),mean ADC(ADCmean),maximum ADC(ADCmax)]of all lesions were measured.The differences in parameters between NPCT1 group and LH group were analyzed,and the diagnostic efficiency of each parameter was analyzed via receiver operating characteristic(ROC)curve.Results The values of BFmean,BFmax,rBFmin,rBFmean and rBFmax of NPCT1 group were higher than those of LH group,with statisti-cally significant difference(P<0.05).However,there were no significant difference in the values of ADCmin,ADCmean and ADCmax between the two groups(P>0.05).The area under the curve(AUC)of BFmean,BFmax,rBFmin,rBFmean and rBFmax values for differen-tial diagnosis of NPCT1 and LH were 0.677,0.804,0.748,0.746 and 0.858,respectively.Conclusion 3D pCASL technique can reflect non-invasively the difference of blood perfusion between NPCT1 and LH,and can be used as an effective method to distin-guish NPCT1 from LH,with the better diagnostic efficiency of BFmax and rBFmax.However,DWI is difficult to distinguish the difference of water molecule diffusion between NPCT1 and LH,which has limited value in differential diagnosis.

Objective To explore the value of multi-parameter MRI in predicting the Ki-67 expression level in nasopharyngeal carcinoma(NPC).Methods The clinical and MRI data of 63 patients with pathologically confirmed NPC were prospectively collected.All patients underwent routine plain and enhanced nasopharyngeal MRI,diffusion weighted imaging(DWI),and arterial spin labeling(ASL)scans before treatment.Multivariate logistic regression analysis was used to identify the independent risk factors for the Ki-67 expression level.Results The degree of enhancement,the maximum blood flow(BFmax),and the minimum apparent diffusion coefficient(ADCmin)were independent risk factors for the Ki-67 expression level in NPC patients.The area under the curve(AUC)of the prediction model established based on these three factors was 0.920,with a sensitivity of 0.792 and a specificity of 0.897,respectively.Conclusion Multi-parameter MRI based on conventional enhancement,ASL,and DWI can effectively predict the Ki-67 expression level in NPC patients.

Objective To explore the predictive value of the nomogram model based on multimodal MRI signs for adverse pregnancy outcomes in placenta accreta spectrum disorders(PAS).Methods The clinical and MRI data of 60 patients with PAS diagnosed by surgery and/or pathology were collected.Multivariate logistic regression was used to analyze the independent risk factors of adverse pregnancy outcomes in PAS.According to the results of multivariate logistic regression analysis,the nomogram prediction model of adverse pregnancy outcomes in PAS was constructed.Results Placenta/uterine protrusion[odds ratio(OR)=6.717,P=0.015],abnormal blood vessels in the placenta(OR=7.929,P=0.009),and diffusion weighted imaging(DWI)placental spike/nodular protrusion into the muscular layer(OR=12.134,P=0.003)were independent risk factors for adverse pregnancy outcomes in PAS.Based on the results,a nomogram prediction model was constructed.The area under the curve(AUC)of the model for predicting adverse pregnancy outcomes of PAS was 0.907,with a sensitivity of 0.906 and a specificity of 0.821.Conclusion The nomogram model constructed based on multimodal MRI signs has certain value in predicting adverse pregnancy outcomes of PAS.

Objective To explore the value of three-dimensional pseudo-continuous arterial spin labeling(3D pCASL)and diffu-sion weighted imaging(DWI)in the differential diagnosis of stage T1 nasopharyngeal carcinoma(NPCT1)and lymphoid hyperplasia(LH).Methods A total of 21 patients with pathological diagnosis and clinical stage of NPCT1(NPCT1 group)and 50 patients with pathological diagnosis of LH(LH group)were selected.All patients underwent nasopharyngeal 3D pCASL and DWI scans before treatment.The blood flow(BF)values of all lesions[minimum BF(BFmin),mean BF(BFmean),maximum BF(BFmax)],and the rel-ative blood flow(rBF)values of the ratio of lesions to lateral pterygoid muscle at the same plane[minimum rBF(rBFmin),mean rBF(rBFmean),maximum rBF(rBFmax)],the apparent diffusion coefficient(ADC)values[minimum ADC(ADCmin),mean ADC(ADCmean),maximum ADC(ADCmax)]of all lesions were measured.The differences in parameters between NPCT1 group and LH group were analyzed,and the diagnostic efficiency of each parameter was analyzed via receiver operating characteristic(ROC)curve.Results The values of BFmean,BFmax,rBFmin,rBFmean and rBFmax of NPCT1 group were higher than those of LH group,with statisti-cally significant difference(P<0.05).However,there were no significant difference in the values of ADCmin,ADCmean and ADCmax between the two groups(P>0.05).The area under the curve(AUC)of BFmean,BFmax,rBFmin,rBFmean and rBFmax values for differen-tial diagnosis of NPCT1 and LH were 0.677,0.804,0.748,0.746 and 0.858,respectively.Conclusion 3D pCASL technique can reflect non-invasively the difference of blood perfusion between NPCT1 and LH,and can be used as an effective method to distin-guish NPCT1 from LH,with the better diagnostic efficiency of BFmax and rBFmax.However,DWI is difficult to distinguish the difference of water molecule diffusion between NPCT1 and LH,which has limited value in differential diagnosis.

Objective:To study the clinical characteristics of growth development and metabolic disorders in obese children and adolescents with insulin resistance (IR).Methods:Normal weight or obese children and adolescents who hospitalized at the Department of Children′s Health Care of Children′s Hospital Affiliated to Nanjing Medical University from September 2015 to April 2018 were recruited.Children′s height, body weight and waist circumference were measured, and waist-to-height ratio (WHtR) and body mass index (BMI) were calculated.Puberty process was determined by Tanner stage.Blood glucose, blood lipid and insulin were measured in fasting state, and homeostasis model assessment of insulin resistance (HOMA-IR) was calculated based on fasting blood glucose and insulin levels.IR was considered when HOMA-IR was over 2.69.Non-alcoholic fatty liver (NAFLD) was diagnosed by abdominal ultrasound.Results:(1) A total of 691 subjects were included, including 183 cases with the age of (9.73±2.38) years in the normal weight group/normal group, and 508 cases with the age of (10.24±2.05) years old in the obese group.The rate of IR was higher in obese group than that in normal group (55.71% vs. 10.38%), and the difference was statistically significant ( P<0.001). (2)HOMA-IR was positively correlated with age ( r=0.256, P<0.001), BMI ( r=0.426, P<0.001), waist circumference ( r=0.454, P<0.001), and WHtR ( r=0.321, P<0.001). After the adjustment for age, sex, and puberty stage, HOMA-IR was also positively correlated with BMI ( r=0.418, P<0.001), waist circumference ( r=0.419, P<0.001) and WHtR ( r=0.375, P<0.001). (3) During puberty, HOMA-IR in both of obese group and normal group was increased, and HOMA-IR in obese group was more particularly serious compared to normal group[TannerⅠ: 2.60(1.49, 3.94) vs.1.28(0.80, 1.90); Tanner Ⅱ: 3.07(1.75, 5.17) vs.1.80(1.16, 2.96); Tanner Ⅲ: 4.33(2.80, 6.57) vs.2.47(1.41, 3.68); Tanner Ⅳ-Ⅴ: 3.49(1.04, 5.78) vs.1.91(0.54, 2.60)], and the differences were all statistically significant(all P<0.05). (4)Compared with the obese objects without IR, obese children and adolescents with IR had higher systolic blood pressure[112(104, 124) mmHg vs.109(98, 121) mmHg, 1 mmHg=0.133 kPa], triglyceride level [1.27(0.95, 1.81) mmol/L vs.1.09(0.79, 1.61) mmol/L], fas-ting blood glucose level [4.80(4.46, 5.01) mmol/L vs.4.48(4.16, 4.76) mmol/L] and fasting insulin level [21.27(16.21, 28.56) mmol/L vs.7.62(4.43, 10.83) mmol/L], and the differences were all statistically significant(all P<0.05). IR was a risk factor for NAFLD in obese children( OR=1.536, 95% CI: 1.049-2.247, P<0.05). Conclusions:Serious and abdominal obesity in children and adolescents is a major risk factor for the development of IR.HOMA-IR of obese children and adolescents is particularly serious during puberty.The obese children with IR are more likely to have metabolic disorders in blood glucose, serum lipid and blood pressure, and have the risk of NAFLD development.

ObjectiveTo summarize the experience of percutaneous nephrolithotomy under flexible ureteroscope in the treatment of staghorn calculi.Method The clinical data of 30 patieits with staghorn calculi undergoing percutaneous nephrolithotomy under flexible ureteroscope were reviewed for summarizing the surgical cooperation experience.Results All operations were successful,with the clearance rates of stage one and stage two calculi 86.0% and 95.0%,respectively.There occurred one case of massive hemorrhage,but no cases of kidney perforation,peritoneal perforation,liquid pneumothorax or organ damage.Conclusion Well-prepared surgical cooperation,full mastery of surgical procedures and skilled cooperation can increase surgical efficiency and safety by shortening surgical duration.