Facial anomalies and mental retardation.
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Axial non-contrast CT of the brain (with thick slice sagittal reformat) demonstrates fused frontal lobes with absent anterior part of the falx cerebri. There is also absence of the septum pellucidum with fusion of the lateral ventricles with rudimentary occipital and temporal horns, with a prominent dorsal cyst.
2 case question available
This case demonstrates features consistent with semilobar holoprosencephaly.