Page 16 - SONO 260 THE FIRST TRIMESTER
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                                                                                      ž The first definitive sonographic sign of an intrauterine pregnancy is identification of the gestational sac within the decidualized endometrium.
ž The blastocyst is the developmental stage of the conceptus that implants into the uterine cavity.
ž The blastocyst gives rise to the gestational sac, or chorionic sac.
ž The early gestational sac appears as a small, anechoic sphere within the decidualized endometrium.
ž It will grow at a rate of 1 mm per day in early pregnancy. Copyright © 2010 Wolters Kluwer Health | Lippincott Williams & Wilkins
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