Authors: Ilan E Timor-Tritsch , Ana Monteagudo, Giuseppe Cali, Hazem El Refaey, Andrea Kaelin Agten, Alan A Arslan.

Conclusion: The location of the center of the gestational sac relative to the midpoint axis of the uterus can be used as an easy method for sonographic differentiation of IUP and CSP between 5-10 weeks of gestation.

 

Link to paper.