Amniotic band syndrome (ABS) may result in fetal anomalies that vary in severity from minor to lethal. Although numerous conditions have been grouped with this diagnosis, a subset of this population will have no other intrauterine abnormalities other than isolated defects of the extremities. ABS may present as constriction rings and congenital amputation affecting the limbs and digits. Routine sonographic evaluation of the fetus in the second trimester can identify the major defects associated with ABS. Detailed evaluation of the fetal extremities, including views of the hands and feet, will increase the detection of minor defects.
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