1. 
   gestational sac
   <radiology> Arises from blastocyst which implants into secretory endometrium surrounded by echogenic trophoblast sac size: 6th week = 17mm;, 8th week = 31 mm, fills chorionic cavity by 12th week visualization of gestational sac, relative to beta-hCG levels: transabdominal scan: greater than 18...
   Found op http://www.mondofacto.com/facts/dictionary?gestational+sac
   
   
2. 
   Gestational Sac
   The sac that surrounds the developing baby inside of a pregnant woman's uterus. The sac contains the baby, the placenta and the amniotic fluid. Synonym(s): Bag of waters Amnion Amniotic Sac
   Found op http://www.pregnology.com/AZ/G/2
   
   
3. 
   gestational sac
   Type: Term Definitions: 1. cystic structure of early pregnancy that represents the amnionic sac, fluid, and placenta.
   Found op http://www.medilexicon.com/medicaldictionary.php?t=79282
   
   
4. 
   Gestational Sac
   A fluid-filled structure containing an embryo that develops early in pregnancy usually within the uterus.
   Found op http://www.thebridgecentre.co.uk/04_causesofinfertility/glossary_of_terms.h
   
   

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