Pseudogestational sac is seen in ultrasonography is suspicious of

Anechoic fluid collections, which might normally suggest an early intrauterine gestational sac, may also be seen with ectopic pregnancy. These include pseudogestational sac and decidual cyst.A pseudosac is a fluid collection between the endometrial layers and conforms to the cavity shape. If a pseudosac is noted, the risk of ectopic pregnancy is increased Reference: William's Obstetrics; 25th edition; Chapter 19; Ectopic pregnancy