An unusual first-trimester sonographic finding associated with development of hydatidiform mole: The hyperechoic ovoid mass

The characteristic vesicular sonographic appearance diagnostic of hydatidiform mole is generally not seen early in pregnancy, and first-trimester findings often cannot be distinguished from those of incomplete or missed abortion [1,2]. This report describes the unusual finding of an ovoid hyperechoic mass within a well-defined gestational sac visualized on endovaginal sonograms at 6.5 weeks' gestation and associated with subsequent development of a molar pregnancy. It may represent the earliest reported sonographic appearance of a molar pregnancy.