Objective To inquire into the CT feature of ovarian germ cell tumors.Methods 46 surgical and pathalogic proved ovarian germ cell tumors in 37 cases with their CT appearance were analyzed retrospectively.The characteristics of their images were discussed correlated with their pathology.Results 46 germ cell tumors in 37 cases composed of 43 teratoma,2 endodermal sinus tumor and 1 mixed germ cell tumor.For teratoma of the ovary,the sensivity of CT and US was all 100%,the specificity of CT and US was 93.02% and 58.14%.In the 30 patients with 38 benign cystic teratomas,CT demonstated 35 tumors in 27 patients,all had fat attenuation,5 had fat-fluid level,11 had a round mass in the cyst,16 had calcification or tooth.5 immature teratoma presented as mainly cystic or solid mass with some calcification and a little small pieces of fat attenuation.Some curved band-like low attenuation area in 1 solid mass were also found on CT.1 endodermal sinus tumor presented as cystic mass and the other one presented as mainly solid mass with large irregular hypodense necrotic area.Mixed germ cell tumer presented as solid mass with irregular border.Conclusion Ovarian teratoma and endodermal sinus tumor had their characteristic CT features.Particularly for teratoma,CT is a better image modelity with specific nature,compared with US.

Objective To explore the imaging(Ultrasonography and CT)characteristics of endodermal sinus tumor of the ovary.Methods US and CT images of endodermal sinus tumor of the ovary in ten patients were analyzed proved by operation and pathology retrospectively and the imaging characteristics were discussed correlated with their pathology.Results All ten patients underwent sonography.In addition,five patients underwent CT scans.On sonography,five showed solid echo,two showed cystic-solid echo and the other two showed cystic echo.The blood flow of solid parts were abundant.In local part,honeycomebed appearance could be seen.On CT,one presented as solid mass with large irregular hyperdense necrotic area,two presented as cystic-solid mass with irregular and blurred cystic area,the other two presented as predominantly cystic mass with multiple internal septations.Conclusion Endodermal sinus tumor of the ovary has their characteristic sonography and CT features,particularly for CT.These imaging characteristics with the patients' age and serum a-fetoprotein levels can be helpful in presurgical accurate diagnosis.

Objective To contrast between the advantage and disadvantage of CR system and screen-film combination in the hypomastia mammography. Methods 233 cases underwent high frequency mammography unit made in Itlian, screen-film combiation and CR system made in Japan, in addition, the imaging quality was analyzed. Results The image quality of CR system was better than screen-film combination. The rate of photographing again outstandingly declined. The radiation to patient decreased evidently. Conclusion CR system is better than traditional screen-film combination in the hypomastia mammography.