Diagnostic Ultrasound in the First Trimester of Pregnancy | GLOWM
Early pregnancy ultrasound measurements and prediction of first trimester pregnancy loss: A logistic model | Scientific Reports
Overlapping imaging features between miscarriage of a low‐lying gestational sac and cervical ectopic pregnancy - Teoh - 2023 - Australasian Journal of Ultrasound in Medicine - Wiley Online Library
What is a Gestational Sac? - Definition from FertilitySmarts