Abstract:Objective To investigate the features and clinical value of CT and MRI in the diagnosis of endodermal sinus tumor of testis in children. Methods A total of 67 children with endodermal sinus tumor who diagnosed by postoperative pathology at Qinghai Women′s and Children′s Hospital from May 2013 to May 2019 were retrospectively selected.Among them, 15 cases received CT examination (10 cases with enhanced examination) and 52 cases underwent MRI examination (36 cases with enhanced examination).The imaging characteristics of children were analyzed. Results The lesions of all patients were single, including 38 cases of left testis and 29 cases of right testis; the diameter of tumor ranged from 9.6 to 47.8(24.32±8.86) mm, with clear edge in 60 cases and fuzzy edge in 3 cases, including 5 cases with round shape and 62 cases with quasi circular shape.In plain CT scan, 11 cases showed mass with different density in the affected side of testis, 4 cases showed homogeneous density of testicular mass, CT value ranged from 37.96 to 55.0(46.31±6.38) Hu.Among 67 cases, 15 cases underwent CT examination and 10 cases underwent enhanced examination.MRI examination was performed in 52 children.Among them, 11 cases showed mixed signal on T1WI, 41 cases showed isointensity or isohypointensity on T1WI; 30 cases showed slightly higher signal on T2WI; 20 cases showed isointense or isointense signal on T2WI.36 cases were examined by enhanced scanning, including 12 cases of mild enhancement, 18 cases of moderate enhancement, 6 cases of obvious enhancement, and no enhancement of necrotic cystic part. Conclusion CT and MRI images of pediatric endodermal sinus tumor can clearly show the morphological characteristics and blood supply of the tumor, which has good diagnostic value for pediatric endodermal sinus tumor.