hydatiform mole

trophoblastic proliferation with avascularity of chorionic villi
marked edema and enlargement of chorionic villi
severe eclampsia prior to 24 weeks
1st trimester bleeding
abnormal elevation of beta-hCG
passing grapelike vesicles per vagina
uterus large for dates (50%)
hyperechoic intrauterine tissue interspersed with numerous punctate hypoechoic areas (hydropic villi)
in 25% atypical appearance: large hyperechoic areas (blood clots) and areas of cystic degeneration; resembles incomplete abortion
thick hyperechoic rim around central anechoic zone
bilateral theca lutein cysts (18-37%)