Intradecidual sac sign of an early intrauterine pregnancy, with a hypoechoic saclike structure (arrow) of less than 5 mm located within the thickened, echogenic decidual reaction of the endometrium (arrowhead).

1
Intradecidual sac sign of an early intrauterine
pregnancy, with a hypoechoic saclike structure
(arrow) of less than 5 mm located within the
thickened, echogenic decidual reaction of the
endometrium (arrowhead).
2
Normal early intrauterine gestational sac with
separation of the hyperechoic decidual
endometrial and gestational sac layers, creating
the double decidual sac sign (arrows).
3
Normal 9-week intrauterine pregnancy shows a
well-defined embryo (arrows) and yolk sac
(arrowhead) with normal separation of the amnion
(A) and chorionic (C) sacs.
4
Early failed intrauterine pregnancy with a
calcified yolk sac (arrow) and embryonic remnant
(arrowhead).
5
Color Doppler ultrasound of an incomplete
abortion with increased vascularity, fluid, and
echogenic debris (arrows) along the endometrium.
6
Grayscale (A) and Doppler (B) transvaginal
ultrasound images of an ectopic (ECT) right
adnexal pregnancy seen as a tubal ring separate
from the right ovary (OV). There is also a small
amount of adjacent particulate free fluid (FF).
7
Grayscale (A) and Doppler (B) transvaginal
ultrasound images of an ectopic (ECT) right
adnexal pregnancy seen as a tubal ring separate
from the right ovary (OV). There is also a small
amount of adjacent particulate free fluid (FF).
8
Pseudogestational sac (arrows) of an ectopic
pregnancy with echogenic material consistent with
hemorrhage filling the endometrial cavity.
9
Endometrial cavity filled with heterogeneous
cystic and solid placental tissue (arrows), which
is characteristic of a complete molar pregnancy.