Objective To study the CT features and the diagnostic value of ovarian tumors in adolescent.Methods CT findings of ovarian tumors in adolescent proved by operation and pathology in 29 cases were retrospectively analyzed and compared with surgical and pathological results.Results Of 29 case , there were 18 cases benign tumors and 11 cases malignant tumors . Among them,there were ovary germ cell tumors 19 cases ( 65.5% ) , epithelial tumors 5 cases ( 17.2% ) , nonneoplastic cystic 3 cases(10.3%) and sex cord stromal tumors 2 cases (7%). CT manifestations included 17 cystic mass ,6 cystic-solid mass and 10 solid mass,in which benign tumors more seen cystic mass and solid in malignant. Torsion of ovarian tumors was found in 5 cases, haemorrhage in cystic mass was detected in 6 cases.Conclusion CT is a valuable imaging modality in the diagnosis of ovarian tumors in adolescent.

Objective To inverstigate the CT findings of non-Hodgkin’s lymphomas in orbit and paranasal sinuses,nasal cavity.Methods 12 patients with non-Hodgkin’s lymphomas in orb it and paranasal sinuses,nasal cavity diagnosed pathology retrospectivly were an alyzed based on their CT data. Results 12 cases of all were non-Hodgin’s lymphoma.Ther e were lymphoma of orbit in 8 cases, lymphoma of maxillary sinus in 3 cases, lym phoma of nasal in 1 case .There was eyelid tumor in 3 cases, soft tissue tumefac tion in adjacent eyelid in 2 cases,soft tissue tumefaction in adjacent maxillary region of nose back in 3 cases and local bone absorption in 2 cases.Conclusion Tumors in orbit and maxillary sinus nasal cavi ty were not concomitant with bone destruction. The sicken tumefaction or tumors formed in adjacent eyelid and maxillay region of nose back are important clue of lymphoma.

Objective To analyze the multi-slice spiral CT(MSCT) angiographic features of hepatic hemangioma accompanied with peripheral arterial-portal shunt(APS),and to assess the MSCT diagnostic ability and clinical value for peripheral APS.Methods 12 cases of hepatic hemangioma accompanied by peripheral APS underwent triphase enhanced MSCT scan,the images were post-processed with maximum intensity projection(MIP),volume rendering(VR) and then analysed.Results During hepatic arterial phase,the peripheral APS and transient hepatic parenchymal enhancement(THPE) could be visualized on MIP and VR.APS were classified into four types according to the findings on VR and MIP.TypeⅠ: Branch of the portal veins early enhancement in peritumoral wedge-shaped enhanced area,more frequently appeared as parellel track sign;TypeⅡ: Showed early opacification of small portal branchs near tumors,APS more frequently found in peritumoral wedge-shaped enhanced area;Type Ⅲ:Included both typeⅠand typeⅡ signs;Type Ⅳ: Only showed peritumoral THPE.Conclusion MSCT angiography provides a new effective technique for demonstrating and understanding peripheral APS and THPE.

Objective To study the hemodynamic change and the machanism of anomalous enhancement of hepatic peripheral area in arterial phase in patients with tumor embolismus in portal vein.Methods The imaging data in 30 cases of hepatic carcinoma (hepatic cell carcinoma in 28 cases and metastatic carcinoma in 2 cases)with tumor embolismus in portal vein confirmed by CT and angiography were reviewed and analysed.Results The tumor embolism were formed in portal stem vein is 3 cases,portal stem vein right and left branches in 18 cases,and right and left branches in 9 cases.The cavernous transformation of portal vein was in 26 cases.The blood vessel grouped and thickened in hepatic portal,the fissure of liver and fossa of gallblader were showed on CT.The hepatic peripheral area was enhanced in arterial phase in 10 cases.Conclusion The collateral branch underwent cavernous transformation after formation of tumor embolism in portal vein the liver blood supply is still maintain.The hepatic peripheral area in arterial phase are anomalously enhanced,it is suggested that the portal vein blood supply is reduction and the arterial blood supply is complemently increased.

Objective To explore the clinical value of magnetic resonance diffusion-weighted imaging ( MR-DWI ) in the early diagnosis of cervical lymph node recurrence after radiotherapy of nasopharyngeal carcinoma, aiming to provide reference for targeted diagnosis and treatment of these patients. Methods The MR-DWI features of 17 patients with recurrent cervical lymph nodes after radiotherapy from 2005 to 2016 were retrospectively analyzed. The results of diagnosis and treatment after lymph node recurrence were summarized. Results The recurrent lymph nodes of 17 patients showed a high signal or mixed signal on MR-DWI images. The sensitivity of MR-DWI and T2WI fat suppression sequence was 100% and 60%. Positron emission tomography-computed tomography ( PET-CT) or biopsy was performed to validate the diagnosis in patients with highly suspected single cervical recurrence. Besides, surgical treatment yielded better clinical prognosis. Conclusions MR-DWI is highly sensitive to recurrent cervical lymph nodes of nasopharyngeal carcinoma after radiotherapy, especially for the small lymph nodes of 5-10 mm in diameter, which are easily ignored. PET-CT examination should be performed, the nature of the lymph nodes should be confirmed by multi-modality imaging diagnosis, and timely operation has important clinical significance in improving the therapeutic effect and quality of life for patients with cervical lymphnode recurrence.

Objective To explore the effect of umbilical cord mesenchymal stem cells with positive human leukocyte antigen(HLA)-G on inducing the production of regulatory T cells(Treg) in vitro.Methods Umbilical cord mesenchymal stem cells were isolated from umbilical cord of neonates. PEGFP-N1-HLA-G plasmid was transfected into the human umbilical cord mesenchymal stem cells by liposome transfection, as PEGFP-N1-HLA-G group. PEGFP-N1 empty vector plasmid was transfected into the human umbilical cord mesenchymal stem cells, as PEGFP-N1 group. The human umbilical cord mesenchymal stem cells without empty vector under the same conditions were set as blank control group. Markers of the umbilical cord mesenchymal stem cells were detected using flow cytometry. The expression of HLA-G protein in each group of cells was identified by Western Blot. After mixed-culturing with CD4+T cells in peripheral blood of healthy subjects for 24 h and 48 h, the proportion of CD4+CD25+Foxp3+Treg in total T cells of each group was detected by flow cytometry. Results CD45, CD34 and HLA-DR presented negative expression on umbilical cord mesenchymal stem cells, while CD29, CD44 and CD105 presented positive expression. HLA-G protein could be expressed in the PEGFP-N1-HLA-G group, which had statistically significant difference compared with the blank control group and PEGFP-N1 group (both P<0.01). After PEGFP-N1-HLA-G group and CD4+T cells were mixed-cultured for 24 h and 48 h, CD4+CD25+Foxp3+Treg accounted for (15.3±1.9)% and (14.3±2.1)% of the total T cells respectively, both of which presented statistically significant difference compared with the blank control group and PEGFP-N1 group (all P<0.05). Conclusions Umbilical cord mesenchymal stem cells with HLA-G gene modified can effectively induce the production of CD4+CD25+Foxp3+Treg in vitro.