Fetal Anomalies Detectable on Ultrasound in the First Trimester
· Head and neck-
Cystic hygroma Fig 1
Large cranial cysts
Anencephaly Fig 2
Exencephaly Fig 3
Encephalocele Acrania Fig 4
Choroid plexus
Dandy-Walker malformation
![](/image/users/72989/ftp/my_files/fig%201%20a.jpg?id=8732571)
Fig 1
![](/image/users/72989/ftp/my_files/fig%202%20a.jpg?id=8732572)
Fig 2
![](/image/users/72989/ftp/my_files/fig%203%20a.jpg?id=8732611)
Fig. 3
![](/image/users/72989/ftp/my_files/fig4%20a.jpg?id=8732614)
Fig. 4
· Spine
Neural tube defects Fig 5
Kyphoscoliosis Fig 6
![](/image/users/72989/ftp/my_files/Fig%205%20a.jpg?id=8732620)
Fig 5
![](/image/users/72989/ftp/my_files/Fig%206%20a.jpg?id=8732621)
Fig 6
· Ventral
Ectopia cordis Fig 7
Omphalocele Fig 8
Gastroschisis Fig 8
Lateral fold defect
![](/image/users/72989/ftp/my_files/fig%207a.jpg?id=8732628)
fig 7
![](/image/users/72989/ftp/my_files/fig%208a.jpg?id=8732629)
Fig 8
· Extremities
Short limb dysplasia
· Heart
Atrioventricular canal defect
Complete heart block
· Genitourinary
Hydronephrosis
Megacystis
Cystic dysplastic kidneys.
· Placenta, umbilical cord and yolk sac
Partial mole
Umbilical cord cysts
Short cord associated with ventral
Fold defect
Large yolk sac
· Multiple gestation
Monoamniotic twins fig 9
Twin-twin transfusion syndrome
Conjoined twins
![](/image/users/72989/ftp/my_files/fig%209.png?id=8732639)
fig 9
NB- Most first trimester anomalies are more clearly visualized using TVS. Many serious anomalies may have a normal sonogram in the first trimester of pregnancy — anencephaly becomes obvious after ossification of the calvarium at or after 12 weeks of menstrual age.
Bacl to Fetla Wellbeing and Growth