Constriction ring syndrome

Constriction ring syndrome occurs when fibrous bands of the amniotic sac (the lining inside the uterus that contains a fetus) become entangled around a developing fetus.

• It’s also known as amniotic band syndrome.
• In some cases, the bands wrap around the fetus’ head or umbilical cord.
• More commonly though, the bands wrap around a limb, fingers or toes, creating severe constrictions. It’s similar to what happens when you wrap a rubber band around your arm or leg.