Diagnosis and Characterization of Multiple Gestations | Radiology Key
First ultrasound only 1 yolk sac - Multiples and Twins | Forums | What to Expect
Yolk sac number does not predict reliably amnionicity in monochorionic twin pregnancies: a case of a monochorionic monoamniotic twin pregnancy with two distinct yolk sacs on early first‐trimester ultrasound - Corbett -