ABSTRACT
Adnexal markers of aneuploidy F.Bonilla-Musoles, L.Machado, N.Osborne, F.Raga, I.Lima-Couy, F.Bonilla Jr
and F.Machado
GESTATIONAL SAC PATHOLOGY
The gestational sac can be observed with transvaginal ultrasound by the 31st day of gestation, which is one week before it can be seen with two-dimensional transabdominal ultrasound. The sac is usually located at one side of the endometrial line. The decidua basalis and parietalis can be distinguished from the decidua capsularis by a small space formed by endometrial secretion, a finding that must not be confused with a decidual abruption. It is important to observe the vascularization of the decidua basalis (chorion frondosum) and to measure its thickness (Figure 1).
