Figure 16a. Hydatidiform mole in a 22-year-old woman who presented at 10 weeks gestation with an elevated level of ß-human chorionic gonadotropin and no visible gestational sac at US. (a, b) T2-weighted images obtained in the coronal (a) and axial (b) planes relative to the uterus show heterogeneous but predominantly high-signal-intensity material filling the uterine cavity (arrow). No gestational sac is present. (c) Axial unenhanced fat-suppressed T1-weighted image shows that the uterine contents have increased signal intensity (arrow). A complete molar pregnancy was confirmed at pathologic analysis.