sac

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Related to chorionic sac: Chorionic villi, extraembryonic mesoderm
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Synonyms for sac

Synonyms for sac

an enclosed space

a case or sheath especially a pollen sac or moss capsule

a member of the Algonquian people formerly living in Wisconsin in the Fox River valley and on the shores of Green Bay

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A study of 316 singleton pregnancies in women with a history of infertility found a miscarriage rate of about 20% when the chorionic sac was seen at 5 weeks' gestation.
The first definitive ultrasound finding of an early intrauterine pregnancy appears consistently in the fifth week of gestation: a circular chorionic sac, typically 5-8 mm wide.
A 5- to 8-mm chorionic sac seen earlier than 5 weeks' gestation probably represents inaccurate dating or a shortened follicular phase resulting from earlier ovulation.
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