Prenatal Evidence of Persistent Notochord and Absent Sacrum Caused by a Mutation in the T (Brachyury) Gene

Figure 2

Longitudinal midsagittal view of the upper body of affected fetus. Flow in the aortic arch and descending thoracic aorta is shown by color flow mapping. No flow is visible inside the translucent tubular structure interpreted as the notochord.