case_images: PMC6449813_01
case_images: Ultrasonographic image of the gravid uterus including one fetal head. The
  choroid plexi are visible as two small symmetric hyperechoic structures
  (arrowhead) within the fetal brain. The falx cerebri is visible as the
  straight echoic line between these structures. A moderate amount of markedly
  echogenic intrauterine fluid is present (thin arrows)
case_images: 10.1177_2055116919841689-fig1.jpg
case_images: PMC6449813_01_10.1177_2055116919841689-fig1.jpg
case_images: fig1-2055116919841689
case_images: Fetal development was advanced, with visibility of the cerebral choroid plexi, and individual heart chambers consistent with at least 50 days' gestation (Figure 1).
case_images: Ultrasonographic image of the uterus, containing two fetuses and zonary
  placenta. One zonary placenta is diffusely hyperechoic (thin arrows), and
  the other is heterogeneously hyperechoic (arrowhead). Anechoic free
  peritoneal fluid surrounds the uterine horn in this view (thick arrow)
case_images: 10.1177_2055116919841689-fig2.jpg
case_images: PMC6449813_01_10.1177_2055116919841689-fig2.jpg
case_images: fig2-2055116919841689
case_images: Another region of zonary placenta was diffusely hyperechoic (Figure 2).