Page 18 - SONO 260 THE FIRST TRIMESTER
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                                                                                      ž The double sac sign denotes the typical appearance of the two distinct layers of decidua, the decidua capsularis (inner layer) and decidua parietalis (outer layer), separated by the anechoic fluid-filled uterine cavity.
ž The measurement of the gestational sac is the earliest sonographic measurement that can be obtained to date the pregnancy.
ž A mean sac diameter (MSD) is achieved by adding the
measurements of the length, width, and the height of the
gestational sac and dividing by 3.
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