This training video describes the 2D and 3D ultrasound features of body stalk anomaly (limb-body wall complex) at 12 weeks' gestation. The sonographic features of the abnormality are major abdominal wall defect, severe kyphoscoliosis, short umbilical cord and various abnormalities and deformities of the limbs.

Body stalk anomaly is regarded as one of the manifestations of the early amnion rupture sequence. This lethal, sporadic abnormality is found in about 1 in 10,000 fetuses  at  11-13+6 weeks.

In this case part of the fetal body is seen in the amniotic cavity and the other part is in the celomic cavity. The rest of the amniotic membrane is intact, suggesting that an abnormal development of the amnion before obliteration of the coelomic cavity, rather than amniotic rupture is a possible cause of the syndrome.

The fetal nuchal translucency is increased in about 85% of the body stalk anomaly cases, but the karyotype is usually normal.

In this case transabdominal image of the malformed fetus was inconclusive, however transvaginal scan with 3D rendering was diagnostic.

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