What Is a Pseudosac

A “pseudosac” is a collection of fluid within the endometrial cavity itself, created by bleeding from the decidualized endometrium associated with an extrauterine pregnancy implantation (Figure 2).

How common are Pseudosac?

Pseudosacs occur in about 10% of ectopic pregnancies and can lead the ultrasound technician, the radiologist, or the treating provider astray if they are identified as a sign of a normal pregnancy and not seen for what they truly are-a potential red herring.

What is a pseudo gestational sac?

The pseudogestational sac sign is a well described entity in the literature in the setting of ectopic gestation, and represents a decidual reaction surrounding intrauterine fluid/hemorrhage without a yolk sac or fetal pole [3,5,8]. As many as 1 in 10 ectopic pregnancies present with a pseudogestational sac.