Important radiology signs in obstetrics and gynaecology

Sign

Seen in

Twin peak sign
/ Lambda (λ) sign

Dichorionic diamniotic

(DCDA)

T-sign

Monochorionic diamniotic

(MCDA)

Lemon sign

Indented frontal bones = Lemon

• Arnold-Chiari II malformation
(Spina bifida)

Banana sign

Curved cerebellum = Banana

• Spina bifida

Bagel sign

Unruptured tubal pregnancy

Double decidual

sac sign

Early Intrauterine pregnancy

Spalding sign

(overlapping of the

fetal skull bones

Intrauterine death (IUD)

Frog eye sign

Anencephaly

Single bubble sign

Hypertrophic pyloric stenosis

Double bubble sign

Duodenal atresia
/ Annular pancreas

Triple bubble sign

Jejunal atresia