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Fetal MRI has done at 26 weeks of gestational age shows :
- bilateral enlarged fetal kidneys filling the abdominal cavity, they show hyperintense cortex with an innumerable small cysts
- severe oligohydramnios
- decrease thoracic size
- enlarged fetal head largely replaced by a disproportionate severe ventriculomegaly, thinned cortical mantle, effaced peri-cerebral space, cortical mantle dehiscence, and occipital meningocele