Abstract: Objective: To study the CT features of atypical ovarian teratomas. Methods: Collected fifty pathologically proved atypical ovarian teratoma patients, then contrasted the pathological character with the CT manifestation. Results: Only one ovarian were involved in atypical ovarian teratoma in all of the fifty cases, 27 cases in the right ovary, and 23 in the left ovary. The diameter of tumors ranged from 1.1 to 12.8 cm. 43 cases were round shape, 5 were phyllode shape, and 2 were of irregular shape. 45 cases were cystic or solid-cystic, and the remaining 5 were solid lesions. Classified the fifty cases according to CT manifestation and pathological character: 38 cases were cystic form, 3 cases were lipoma form without mural, 5 cases were solid mass form and 4 cases were mixed mass form. 38 cases of cystic form, of which low density were seen in 12 cases, high density in 9 cases, thick mural in 9 cases and thin mural in 8 cases. Conclusions: atypical ovarian teratomas can show some similar CT features which will benefit diagnose and differential diagnose of the disease.