Transverse transpelvic sonogram of a partial hydatidiform mole (PHM) at 16 weeks of menstrual age. The major imaging feature distinguishing PHM from complete hydatidiform mole (CHM) is the presence of fetal tissue on the left side of the image (mother's right side). Note the normal-appearing placental tissue along the posterior wall of the uterus in the midline and the many small cysts that replace the placental tissue on the right side (mother's left side). This finding has a distribution more focal than that typically found in CHM.


http://emedicine.medscape.com/article/405778-media‎