We report the case of a nulliparous 36-year-old Portuguese female at 14 weeks of gestation for her first prenatal visit in our hospital. The medical history was unremarkable without known underlying conditions (medical or surgical).In ultrasound (US) performed at 14 weeks and 3 days, we found a singleton live fetus with normal amniotic fluid volume. Fetal biometry was not consistent with late period date because the crown-rump-length was found to be smaller than expected. The fetal anatomy above the midthorax, including the heart and the intracranial structures, appeared normal. Below this level, however, a sudden termination of spine at the lumbosacral level was seen [Figure 1]. In the transverse section, the sacrum was missing, and the iliac wings are positioned in midline close to each other [Figure 2].
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