Purpose To evaluate the characters of corpus luteum in ectopic pregnancy (EP) and early intrauterine pregnancy with transvaginal color Doppler sonography.Materials and Methods Transvaginal sonographic findings of corpus luteum in 64 cases with ectopic pregnancies confirmed by surgery and pathology (group A) and 71 normal pregnant women (group B) were retrospectively reviewed.Results The corpus luteum could be divided into four types according to sonographic appearance:hypoechoic solid (group A,n=33;group B,...