Pseudogestational sac in ectopic pregnancy.

A case of tubal pregnancy demonstrated by sonography is presented. In addition to the true ectopic gestational sac, an intra-uterine structure closely resembling a gestational sac was detected simultaneously. Such a finding of a pseudogestational sac in the uterine cavity may mislead to the diagnosis of an intra-uterine gestation. Thus, this sonographic finding is not sufficient to exclude the diagnosis of ectopic pregnancy. Clinicians should be aware of the possible finding of a pseudogestational sac in cases of ectopic pregnancy and the pathophysiological basis of this phenomenon is discussed.