Video- First trimester
Normal First Trimester	Abnormal First Trimester
Normal fetal heart beat – M mode (8 wks GA)	Amniotic band syndrome
Normal scan – CRL = 4mm	Bradycardia (6.5 wks GA)
Normal 6 week scan	Chorioamnionitis
Normal 7 week scan	Chorioamniotic Separation
Normal 8 week scan	Echogenic Molar Pregnancy
Normal 9 weeks scan	Ectopic Pregnancy – Live Pregnancy
Amnion and Yolk sac – Normal 9.5 week scan	Ectopic Pregnancy - Yolk sac
Amnion - Normal appearance at 12 wks	Elongated gestational sac
Rhombencephalon	First Trimester Oligohydramnios (12 wks GA)
Vitelline duct	Oligohydramnios in the first trimester
Yolk sac	Perigestational Hemorrhage
	Perigestational hemorrhage - active bleeding
Nuchal Translucency Screening
Increased Nuchal Translucency - Normal Karyotype	Increased Nuchal Translucency - Trisomy 21
Multiple Gestations
Monochorionic Diamniotic Twins- Only 1 yolk sac seen	Split Membrane sign of Dichorionic twins
Monochorionic Diamniotic Twins - Membranes	Dichorionic Twins
Monochorionic Diamniotic Twins - 2  yolk sacs seen	Conjoined twins (craniopagus) at 10.5 weeks of gestation