Figure 20b. Gastroschisis and skeletal dysplasia at 13 weeks gestation. (a) Sagittal transabdominal US image of the fetus shows free-floating bowel loops (arrow), which have herniated through a defect in the anterior abdominal wall. The NT thickness is 5 mm (cursors). (b) Axial transabdominal US image of the fetal abdomen shows the insertion of the umbilical cord (curved arrow), which is to the left of the bowel loops (straight arrow). S = stomach. (c) Transabdominal US image shows the femur, which is 7 mm long (cursors), below -4 standard deviations for gestation. All of the long bones were abnormally short. Bilateral clubfoot was also seen. These findings were confirmed at pathologic examination; the skeletal dysplasia was a form of chondrodysplasia punctata.