Encephalocele. Tomographic ultrasound imaging (upper) and MR imaging (lower) in a case of encephalocele at 28 weeks of gestation.

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... occultum. Encephalocele occurs in the occipital region in 70% to 80%. Acrania, exencephaly, and anencephaly are not independent anomalies. It is considered that dysraphia (absent cranial vault, acrania) occurs in very early stage and disintegration of the exposed brain (exencephaly) during the fetal period results in anencephaly. Encephalocele (Fig. 3) is often observed in the median section and in the parietooccipital part. ABS should be differentiated from acrania during early pregnancy, because ABS has completely different pathogenesis from acrania/exencephaly. In cases of ABS, cranial destruction occurs secondary to an amniotic band; similar appearance is often ...