A Case of Exencephaly Caused by Amniotic Band: Antenatal Diagnosis in the First Trimester

Abstract

We present a case of exencephaly with amniotic band syndrome at 12 weeks of gestation. Ultrasonographic examination showed absence of the fetal cranium, and the brain appeared to be exposed in the amniotic cavity. In addition, a string-shaped structure originating from the brain and extending to the placenta was noted. At 13 weeks of gestation, induced abortion was carried out, and the diagnosis was confirmed. To our knowledge, this is the first case of its kind to be diagnosed by transvaginal ultrasonography in the first trimester of pregnancy.