Amniotic Band Syndrome – What It Means for You and Your Baby
Overview
Amniotic Band Syndrome is a rare condition that happens in about 1 out of every 15,000 births. It occurs when the inner layer of the amniotic sac (the “bag of waters” that surrounds the baby during pregnancy) tears early. This tear creates thin, string-like bands that can float around and wrap around parts of the baby’s body—most often the arms, legs, fingers, or toes.
These bands can cause problems by:
- Tightening around a limb, which may block blood flow or growth
- Causing swelling or limiting movement
- In some cases, they can even cause amputations (loss of fingers, toes, or part of a limb) before the baby is born
The exact cause is unknown, and it’s not inherited or caused by anything the mother did. It’s usually diagnosed during an ultrasound in pregnancy.
Is There a Treatment?
In some cases where a band is tightly wrapped around a baby’s limb but no amputation has occurred yet, doctors may recommend fetal surgery. This is done using a special camera (fetoscope) and tiny instruments inserted through the mother’s belly into the womb. The goal is to carefully cut the band and relieve the pressure, allowing normal development to continue.
- Surgery may help save the limb, prevent further damage, and improve how well the baby’s arm or leg works after birth.
Not every case is treated with surgery—it depends on the baby’s condition and how severe the constriction is.
Amniotic band syndrome is a rare condition that occurs by chance in approximately 1 in 15,000 live births. It is believed that amniotic band syndrome occurs because of early rupture of the amnion, or one layer of the bag of waters that is closest to the fetus. The ruptured amnion then forms bands that cross the womb and can attach onto the body of the baby, thereby causing amputations, constrictions and/or other deformities. The cause of the syndrome is not known. The diagnosis of amniotic band syndrome is made during the pregnancy by ultrasound.
Some fetuses with amniotic band syndrome develop swelling of an extremity without evidence of amputation. The constriction results in marked edema and dysfunction of the extremity at birth. It is thought that fetoscopic (surgery using a scope placed into the womb) release of the amniotic bands could be of benefit in these cases. In utero endoscopic release of the constriction has been shown to result in restoration of the contour of the extremity and normal function after delivery. It is believed that in utero endoscopic release of the constriction may be able to avoid amputation of the extremity or prevent further neurological or vascular damage.
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