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Updated: Jan 20, 2026

A Novel Use of Three-dimensional High-frequency Ultrasonography for Early Pregnancy Characterization in the Mouse
Published on: October 24, 2017
Pseudoembryo associated with pseudogestational sac: A novel sonographic finding in ectopic pregnancy
Srikanth Puttagunta1, Stefanie Yan Lee1
1Department of Radiology, McMaster University, Jurvavinski Hospital, 711 Concession St, Hamilton, Ontario L8V 1C3, Canada.
Abstract:
In this case report, we present a case of a hitherto undescribed "pseudoembryo" appearance in a fluid-filled endometrial cavity in ectopic pregnancy. Knowledge of this sonographic finding is clinically important, since the presence of a "pseudoembryo" could lead to the misidentification of a pseudogestational sac as an intrauterine pregnancy in the setting of ectopic pregnancy. This paper discuss reviews the pseudogestational sac and imaging findings which differentiate it from a true intrauterine gestation.
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