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In ABS, the amnion undergoes a tear but the chorion is intact. In the case, the free edge of the amnion encircles various parts of the foetus and causes constriction. The theories causiing this are unknown and usually accidental in nature. But chances of it happening in future pregnancies is remote. In some cases where there is danger of amputation
of a limb of the foetus or compression of the umbilical cord
, some Hospitals offer Foetal surgery to remove these bands.