The human umbilical vesicle ('yolk sac') and pronephros—Are they vestigial?
Sonographic Evaluation of the Yolk Sac - Tan - 2012 - Journal of Ultrasound in Medicine - Wiley Online Library
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Yolk sac | Radiology Reference Article | Radiopaedia.org
thecal sac - YouTube
Yolk Sac at Ultrasound: What It Is and What It Means If It's Not There
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![Figure, Normal gestational sac. Image courtesy S Bhimji MD] - StatPearls - NCBI Bookshelf](https://www.ncbi.nlm.nih.gov/books/NBK551624/bin/Gestational__sac.jpg "Figure, Normal gestational sac. Image courtesy S Bhimji MD] - StatPearls - NCBI Bookshelf")
Figure, Normal gestational sac. Image courtesy S Bhimji MD] - StatPearls - NCBI Bookshelf
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7month Fetus In Womb Stock Photo - Download Image Now - Placenta, Fetus, Uterus - iStock
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Gestational sac - Wikipedia
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What is a Gestational Sac? - Definition from FertilitySmarts
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