Objective To summarize the MSCT signs and the key points of differential diagnosis of sclerosing mesenteritises (SM) which were misdiagnosed by clinical and CT,to reduce the misdiagnosis rate.Methods Clinical and MSCT data of 23 misdiagnosed SM patients were analyzed retrospectively.The misdiagnosed diseases,misdiagnosed causes,and differential diagnosis were analyzed.Results SM were mainly misdiagnosed as tumor and infective inflammation.The main causes of misdiagnosis and differential diagnostic features were listed as follows.(1)SM didn't have specific clinical manifestations.(2)The density of the adipose tissue in mesentery increasedmisty mesentery.A clear demarcation between the lesion and the surrounding normal fatty tissue could be differentiated from infective inflammation.(3)The mass-like false capsule had space-occupying effect of displacement of the surrounding structures.However, the blood vessels were encapsulated by the mass-like false capsule with fat ring around, which could be differentiated from fat-containing tumors.(4)The soft mass was formed at the root of the mesentery.The fat halo sign and mild enhancement of the mass can be differentiated from lymphoma and carcinoid.Conclusion SM is easily misdiagnosed both in clinical practice and medical imaging.Recognition of differential diagnostic features of MSCT can reduce the misdiagnosis rate.

Aim To investigate the effect of curcumin on radiosensitivity of radioresistant nasopharyngeal carcinoma cell line CNE-2R and its mechanism.Methods The concentration of curcumin was screened by MTT assay.Dose-survival curves were obtained according to the colony forming test for L-Q matching and multitarget-single hitting matching,while SF2 and the correlation parameters of radiation biology were calculated.The changes of cell cycle in CNE-2R cells caused by curcumin were also tested by flow cytometry(FCM).The differential expression of genes related to cell cycle and DNA damage repair were detected by RT-qPCR.Results CNE-2R cells could not be inhibited by 10 μmol·L-1 curcumin.Dealt with 10 μmol·L-1 curcumin for 24 h,the value of α/β increased to 1 596 from 6.56;the value of SF2 decreased to 0.361 Gy from 1.93 Gy;the value of N decreased to 1.06 from 1.60;the value of D0 decreased to 2.12 from 3.27;the value of Dq decreased to 0.12 from 1.53.FCM showed that the cells in G2 phase had a significant increase and the cells in S phase had a significant decrease after dealt with 10 μmol·L-1 curcumin for 24 h.The expression of CDK4 was significantly up-regulated and GADD45g,BRCA1 were significantly down-regulated.Conclusion Curcumin radiosensitizes nasopharyngeal carcinoma cell line CNE-2R by changing cell cycle and affecting DNA damage repair through regulating the expression of CDK4,GADD45 g and BRCA1.