KEY FACTS Imaging • Polydactyly ○ 1 or more extra digits or parts of digits ○ May be preaxial (thumb side) or postaxial (pinky side) ○ Nonsyndromal: May be isolated…

KEY FACTS Terminology • Synonym: Partial mole • Definition: 69 chromosomes (instead of 46) ○ Most common is diandric triploidy (extra set is paternal) ○ Digynic triploidy if extra set…

IMAGING ANATOMY Vertebral Bodies • Ossified vertebral body appears echogenic ○ Cartilaginous tip at spinous process appears hypoechoic • Cervical : Upper 7 vertebrae ○ C1 (atlas): No body, spinous…

KEY FACTS Terminology • 3 or more embryos/fetuses with any combination of ○ Separate or shared chorionic sacs ○ Separate or shared amniotic sacs Imaging • Establishment of chorionicity is…

KEY FACTS Terminology • Abnormal accumulation of fluid in 2 sites (pleural, pericardial, ascites, skin) Imaging • Pleural effusion surrounds lung, which floats toward hilum: Angel wing sign • Large…

KEY FACTS Terminology • Spectrum of anomalies, including absence or hypoplasia of radius, radial carpal bones, &/or thumb Imaging • Single forearm bone • Radial deviation of hand ○ Fixed…

KEY FACTS Terminology • Fetus is pathologically small (growth restricted) ○ Fetal growth restriction (FGR) ○ Intrauterine growth restriction • Small for gestational age ○ Fetus is small but healthy,…

KEY FACTS Terminology • Several definitions in use ○ Focal dilatation of umbilical vein (UV) > 9-mm diameter ○ Varix diameter 50% > intrahepatic portion of UV ○ UV diameter…

KEY FACTS Terminology • Umbilical cord with single umbilical artery (SUA) and 1 umbilical vein (UV) instead of 2 UAs and 1 UV • Also referred to as 2-vessel cord…

KEY FACTS Terminology • Placenta previa (PP) : Placenta covers cervix internal os (IO) • Low-lying placenta (LLP) : Placenta edge < 2 cm from IO • Normal: Placenta edge…