Complete mole. (a) Longitudinal US image of the uterus shows distention of the uterine cavity by echogenic material (M). The echogenic material has the classically described snowstorm appearance of a complete mole. The normal hypoechoic myometrium (U) can be seen at the periphery. C = internal cervical os. (b) US image shows a multicystic structure within the uterus, a finding consistent with a complete mole. No identifiable fetal tissue was present. Molar tissue can be variable in morphology. (c) CT image of a patient with a β-hCG level of 620,000 mIU/mL shows a predominantly low-attenuation mass in the uterus with heterogeneous foci of internal enhancement. Pathologic examination demonstrated a complete mole without myometrial invasion. The multicystic structure posterior to and to the right of the uterus is an enlarged ovary with theca lutein cysts. CT can be used to assess for invasion by gestational trophoblastic disease.
部分性葡萄胎 Partial mole. US image shows echogenic material filling the majority of the uterine cavity. Adjacent to this material is a gestational sac containing an embryo (arrowhead). These findings were due to a pathologically proved partial mole. The differential diagnosis for this appearance includes a large subchorionic hemorrhage. These two entities can be distinguished on the basis of the β-hCG level and the presence of vascular flow within the molar tissue. No flow would be expected in a hemorrhage.