Objective To research special signs of MRCP,its pathological and clinical significance in carcinoma of pancreatic head.Methods 35 patients with pancreatic head carcinoma confirmed by operation and /or pathology were examined by MR before operation,including SE sequences T_1WI,FSE sequences T_2WI,T_2WI FS and MRCP.Results The special signs of MRCP in pancreatic head cancer were showed in all cases(100%),these signs included:type C1+P1 in 31 cases,type C2+P1 in 2 cases and type C2+P2 in 2 cases.The volumes of pancreatic cancer shown by MRCP were bigger than ones in operated.Conclusion MRCP features of carcinoma of pancreatic head are special.

Objective To study the diagnostic value of MRCP in cholangiocarcinoma.Methods MRCP in 39 patients with cholangiocarcinoma comfirmed by surgery and pathology were performed on a GE 1.5T superconductive MR imaging unit before operations.Results MRCP imagings with diagnostic value were obtained in 39 cases,MRCP accurately showed the obstructive positions confirmed by surgery and pathology in all cases (100%).The qualitative rate of cholangiocarcinoma was 97%(38/39).Conclusion MRCP can not only accurately show the position of cholangiocarcinoma but also make accuracy diagnosis.

Objective To research the special manifestations of magnetic resonance cholangiopancreatography(MRCP) in carcinoma of pancreatic head.Methods MRCP in 22 cases with pancreatic head carcinoma confirmed by operation and pathology (including SE sequences with T1WI and fat saturation,FSE with T2WI and fat saturation and MRCP in coronal sectior) were performed before operations.Additional CE MRA on abdominal vessels including abdominal ateries, portal veins and superior mesenteric arteries and their veins in 16 cases also examined before operations. Results Carcinomas of the pancreatic head were diagnosed correctly by MRCP in 21 cases, and 1 case was misdiagnosed as chronic pancreatitis. MRCP all demonstrated abrupt interruption at pancreatic head segments of dilated left common bile duct and main pancreatic duct at the pancreatic head ones, their left segments were dilate with higher signal and both didn't cross each other, because they were destroyed by carcinomas of pancreatic head. Destruction and no cross each other of pancreatic head segments of choledochus and main pancreas duct,it was called "no cross sign". CE MRA demonstrated destruction of abdominal ateries in 3 cases, portal vein in 3 cases and superior mesenteric vein in 4 cases and not being resected.Conclusion "No cross sign"on MRCP examination is of important value in diagnosis of carcinoma of the pancreatic head.

To explore whether the severity of LA in patients with acute ischemic stroke（AIS）with large vessel occlusion（AIS-LVO） was related to the prognosis of MT treatment. Methods A total of 75 AIS-LVO patients who received intravenous thrombolysis（IVT） bridging MT or MT alone were selected in the stroke center of our hospital from April 2016 to October 2021.According to the Fazekas score scale，the severity of LA was divided into non-mild group（0-2 points，n=44） and moderate-severe group（3～6 points，n=31）. The baseline data and postoperative outcome of MT were compared between the two groups. The prognosis at 90 days after operation was evaluated by modified Rankin scale（mRS）. The results were divided into two groups：good prognosis group（0～2 points，n=32） and poor prognosis group（3～6 points，n=43）. Univariate analysis and multivariate Logistic regression analysis were used to determine whether LA was related to the prognosis of at 90 days after MT.Results Univariate analysis showed that compared with the non-mild LA group，the moderate-severe LA group had an older age［（73.77±8.25） vs（63.00±10.50） years old］，higher female proportion（58.1% vs 22.7%），higher proportion of atrial fibrillation（61.3% vs 36.4%），lower proportion of hyperlipidemia（9.7% vs 29.5%），higher incidence of postoperative hemorrhage transformation（38.7% vs 13.6%），higher incidence of sICH at 72 hours after operation（19.4% vs 2%），higher rate of futile recanalization（78.6% vs 39.0%），and higher incidence of 90-day poor prognosis after operation（80.6% vs 40.9%）. There were significant differences between two groups（all P<0.05）. Univariate analysis showed that compared with the good prognosis group，the poor prognosis group had an older age［69.0（63.0，77.0）vs 63.5（53.0，75.5）years old］，higher baseline NIHSS score ［（17.8±6.8） vs（12.3±4.9） points］，higher fasting blood glucose level［6.78（5.71，10.43） vs 5.88（5.29，6.95）］ mmol/L］，higher neutrophil to lymphocyte ratio（NLR） ［4.48（1.92，8.11） vs 2.4（1.43，3.06）］，higher proportion of diabetes（37.2% vs 12.5%），and higher proportion of moderate-severe LA（58.1% vs 18.8%）. There were significant difference between two groups（all P<0.05）.Multivariate Logistic regressionanalysis showed that moderate-severe LA（OR=6.796，95%CI 1.564～29.530，P=0.011）and baseline NIHSS score（OR=1.156，95%CI 1.015～1.317，P=0.029） were independent risk factors for poor 90-day functional prognosis after MT.Conclusion Moderate-severe LA can independently predict the poor prognosis of patients with AIS-LVO after MT.