KEY FACTS Imaging • ↑ middle cerebral artery (MCA) peak systolic velocity (PSV) suggests diagnosis of fetal anemia • High-output heart failure is late finding ○ Cardiomegaly, polyhydramnios ○ Hydrops…

KEY FACTS Terminology • Mandibular hypoplasia with cleft palate and glossoptosis (backward and downward displacement of tongue) Imaging • Severe micrognathia on midsagittal view in midtrimester ○ 1st-trimester diagnosis has…

KEY FACTS Terminology • Discordant twin growth most commonly defined as 20% difference in estimated fetal weight (EFW) between fetuses ○ Percentage difference in EFW = EFW larger – EFW…

KEY FACTS Terminology • Complex genetic disorder with principle features including macrosomia, macroglossia, and omphalocele Imaging • Macroglossia most consistent finding ○ Persistent protruding tongue throughout exam with inability to…

KEY FACTS Terminology • Lethal skeletal dysplasia ○ Thanatophoric is Greek for death bearing • Divided into 2 subtypes based on morphologic findings Imaging • Features seen in both TD1…

KEY FACTS Terminology • Disorders of sexual development (DSD) • Most common DSD if karyotype is XY (male) ○ Hypospadias: Urethra opens on underside of penis ○ Epispadias (less common):…

KEY FACTS Terminology • Syndrome composed of classic triad of findings ○ Renal cystic dysplasia in 95-100% ○ Encephalocele or other central nervous system (CNS) abnormality in 90% ○ Postaxial…

KEY FACTS Terminology • Membranes insert on fetal surface of placenta instead of along edge ○ Edges not “tacked down” & curl away from uterine wall Imaging • Edge of…

KEY FACTS Terminology • Lethal skeletal dysplasia with 3 clinical subtypes ○ Type IA (poorly ossified skull, unossified spine) ○ Type IB (poorly ossified skull, rib fractures) ○ Type II…

KEY FACTS Terminology • Abnormality of renal fusion &/or ascent Imaging • Horseshoe kidney (fused lower poles) ○ Isthmus = central bridging tissue – Isthmus is anterior to aorta ○…