Objective To analyze the degeneration parameters of the multifidus muscle at the disjunc-tion in patients with isthmus spondylolisthesis and its correlation with the degree of spondylolisthesis.Meth-ods A retrospective analysis was conducted on the medical records and MRI imaging data of 59 patients with isthmus spondylolisthesis who visited this hospital from January 2022 to July 2024.The degeneration parame-ters of multifidus muscle were selected and assessed as cross-sectional area(CSA)and percentage of fat infil-tration area(FIA%).CSA and FIA%of the multifidus muscle at the disjunction and the previous non-sliding disconnection segment were measured and compared using Image J software.The degree of spondylolisthesis was evaluated referring to the Meyerding standard,and the correlation was analyzed between CSA,FIA%of the multifidus muscle at the disjunction and the degree of spondylolisthesis.Results Among the 59 patients,there were 2 cases of L3 spondylolisthesis,27 cases of L4 spondylolisthesis and 30 cases of L5 spondylolisthe-sis.CSA of the multifidus muscle at the disjunction and the previous non-sliding disconnection segment were(882.22±236.01)mm2 and(845.59±263.37)mm2 respectively,the difference was not statistically significant(t=0.796,P=0.428).FIA%were 37.16%(25.56%,50.78%)and 33.26%(18.65%,43.04%)respective-ly,the difference was statistically significant(Z=-2.008,P=0.045).Among the 59 patients,50 cases(84.75%)had grade Ⅰ spondylolisthesis,9 cases(15.25%)had grade Ⅱ spondylolisthesis,there were no pa-tients with grade Ⅲ or Ⅳ spondylolisthesis.The degree of spondylolisthesis was correlated with FIA%(r=0.443,P<0.001),but not correlated with CSA(r=-0.188,P=0.153).Conclusion In patients with isth-mus spondylolisthesis,FIA%of the multifidus muscle at the disjunction is significantly higher than that in the previous non-sliding disconnection segment,and it is related to the degree of spondylolisthesis.However,CSA of the multifidus muscle at the disjunction showed no significant difference from that in the previous non-slid-ing disconnection segment and was not correlated with the degree of spondylolisthesis.FIA%is more accurate in assessing the severity of multifidus muscle degeneration than CSA.

Objective To evaluate MRI in judging the therapeutic effect of argon-helium cryoablation therapy for prostate cancer. Methods The clinical data and imaging materials of 16 patients with prostate cancer , who had received ultrasound-guided argon-helium knife cryogenic treatment at authors ’ hospital during the period from March 2012 to Oct. 2014, were retrospectively and comprehensively analyzed. The preoperative and postoperative laboratory test results were compared with MRI findings, and the ablation effect was assessed, focusing on the surgical residue, metastasis, etc. Results One months after the surgery, MRI demonstrated that satisfactory ablation extent was obtained in all patients, the ablated tumor tissue was characterized by long-T2 signal and no obvious recurrence could be found on DWI and DCE-MRI. A slight decrease of PSA level was observed. Six months after the surgery, MRI revealed that the prostate size was significantly reduced, PSA level was markedly decreased and no obvious evidence of recurrence was observed. No severe postoperative complications, such as urethral necrosis, urethral stricture or urethro-rectal fistula, occurred. During the 6-month following-up time, one patient died from other causes. Conclusion MRI has excellent clinical application value in estimating the ablation extent and in judging postoperative recurrence or metastasis of prostate cancer after argon-helium cryoablation treatment.

0 05), but MTT had significant difference( F =10 2, P

Objective To investigate the conventional MRI and perfusion weighted imaging (PWI) features of central neurocytoma(CNC), and to evaluate the potentiality of them in diagnosing accuracy. Methods Three patients with CNC proved pathologically were collected, 4 patients with ependymoma were as control group, with conventional MRI and perfusion weighted imaging were performed in all of them. MRI features were observed, and relative regional cerebral blood volume (rrCBV) were calculated.Results CNCs were isosignal on T_1WI, hyperintense on T_2WI, minimal enhancment. Ependymomas were hypointense or isosignal on T_1WI, slightly hyperintense or hyperintense on T_2WI and minimal enhancement. On PWI, CNCs were obviously high-perfusion, rrCBV was 11.2, but which was 2.1 in ependymoma, there was statistically signifcant difference between two groups(P

Objective To investigate the value of MR perfusion weighted imaging(PWI) features in typing meningioma preoperation.Methods MR perfusion weighted imaging was performed on 39 patients with pathologically proved meningioma.The relative regionalcerebral blood volume(rrCBV) and relative mean transit time(rMTT) were calculated.Results The rrCBV and rMTT of angioblastic meningiomas were 11.8 and 1.8,which were higher than that of the others subtype.The rrCBV of meningothelial meningiomas andtransitional meningiomas were 8.3,7.5 respectively,the rMTT of them were 1.5 and 1.3,there was statistically significant difference in rMTT between two groups,but no difference in rrCBV.The rrCBV of fibrous meningiomas was 4.0,which was lower than that of the others.Conclusion PWI is very useful in typing meninigioma preoperation.