Objective To analyze the CT manifestations of mesenteric panniculitis,so that to improve CT diagnosis of mesenteric panniculitis.Methods Seven patients with mesenteric panniculitis,which were diagnosed according to the CT criteria,were analyzed.Results The fatty masses with defined margins and around the root of the jejunum were found in all patients at CT scan,and there were no enhancement after administration of contrast medium.The masses were sharply defined with abdominal and retroperitoneal fat.There were pseudo-capsule in 7, "arcus adiposus sign" in 5. Enlargement of lymph nodes in the masses and retroperitoneum in 2 cases were seen,respectively.4 patients had abdominal operations,one patient was in combination with carcinoma of head of pancrease.Conclusion Certain features of the CT manifestations of mesenteric panniculitis can be found,CT is effective for the diagnosis of mesenteric panniculitis.

Objective To investigate the CT and MRI features of ovarian fibroma.Methods CT and MRI findings of 42 patients with ovarian fibroma confirmed by operation and pathology were analyzed retrospectively.Twenty-one patients were examined by CT,26 cases was examined by MRI,and 5 cases were examined by CT and MRI.Results In 42 cases of ovarian fibroma,there were simple type in 29 cases,degenerative type in 11 cases,and special type in 2 cases.All the cases had single lesion,morphology were round or elliptic or lobulated,clear boundary in 40 cases,partial fuzzy boundary in 2 cases,3 cases with calcification,hemorrhage in 1 case.The maximum tumor diameter were 1.4-26.7 cm,median value was 5.5 cm.Simple type of ovarian fibroma were equal density on CT,low signal on T1WI and T2WI.Degeneration type was patchy,fissure,low density areas on CT or high signal on T2WI,and the tumor parenchyma was almost no enhancement or only slight enhancement.A large number of hemorrhages had been found in 1 special type patient,and significantly enhanced in the other special type patient.Special type were misdiagnosed as malignant tumor.Conclusion CT and MRI performance of ovarian fibroma has some characteristics,but diagnosis still need to rely on pathology.

Objective To explore the value of combination of diffusion weighted imaging(DWI)and dynamic contrast-enhanced MRI(DCE-MRI)for predicting recurrence of hepatocellular carcinoma(HCC)after TACE combined with radiofrequency ablation.Methods Date of 80 HCC patients who underwent TACE combined with radiofrequency ablation were retrospectively analyzed.Abdominal DWI and DCE-MRI were performed 10 days before as well as 20,60 and 90 days after treatment.The sensitivity,specificity and accuracy of combination of DWI and DCE-MRI for predicting recurrence of HCC 20 days after TACE combined with radiofrequency ablation were calculated,and receiver operating characteristic(ROC)curve was drawn to evaluate the efficacy of apparent diffusion coefficient(ADC)value for predicting recurrence of HCC 20 days after treatment.Results Patients with HCC were divided into stable group(n=47)and progressive group(n=33)according to modified response evaluation criteria in solid tumors.Twenty days after TACE combined with radiofrequency ablation,most HCC lesions in stable group presented as uneven DWI signals and high ADC signals without enhancement,while those in progressive group mainly presented as high DWI signals and low ADC signals with mild enhancement.The sensitivity,specificity and accuracy of combination of DWI and DCE-MRI for predicting recurrence of HCC 20 days after TACE combined with radiofrequency ablation was 97.75％(87/89),92.31％(24/26)and 96.52％(111/115),respectively,and the AUC of ADC value was 0.82.Taken 1.42X10-3 mm2/s as the cutoff value of ADC,the sensitivity and specificity of ADC value for predicting recurrence of HCC 20 days after TACE combined with radiofrequency ablation was 72.13％and 82.25％,respectively.Conclusion Combination of DWI and DCE-MRI had certain value for predicting recurrence of HCC after TACE combined with radiofrequency ablation,and ADC could be used as an effective predicting index.