Human embryo at 10 weeks' gestation.

A 29-year-old woman presented to the hospital with an angular pregnancy diagnosed at 60 days of gestation. Ultrasonography 1 week later showed a thinner cornual muscle with a thickness of 2.8 mm. The patient decided to terminate the pregnancy after informed consent was provided. A diagnostic hysteroscopy revealed an angular pregnancy and typical structures such as a decidua capsularis, smooth chorion, extraembryonic coelom, umbilical vesicle (yolk sac), amnion, umbilical cord, vitelline artery and vein, umbilical arteries and vein, decidua basalis, and villous chorion (Figures 1 and 2 and Video).