An irregular echo-less area around the gestational sac is a fluid echo around the gestational sac, which usually indicates the presence of blood accumulation. An irregular echo-less area around the gestational sac can also be referred to as a fluid dark area, which can generally indicate the presence of blood accumulation next to the gestational sac. Fluid accumulation, pus accumulation, amniotic fluid, blood and other body fluids can be presented as anechoic areas on ultrasound, which are commonly associated with accumulation of blood and may be caused by preeclampsia. There is a large amount of blood in the uterine cavity in cases of heavy bleeding with preeclampsia, and an echogenic area is seen encircling the side of the gestational sac in cases of small amount of bleeding, so the irregular echogenic area next to the gestational sac may be caused by preeclampsia. The discovery of preeclampsia, need to promptly consult the hospital for fertility preservation treatment.