Hydranencephaly

1-Water bag in the skull.

2-Mid line falx is seen or a part of it.

3-Normal thalami.

4-Remaining brain tissue seen in the temporal and occipital areas.

Transaxial view near the vertex shows a disrupted falx (curved arrow). No normal cortical mantle remains.

Transaxial view at the level of the normal thalami (T) shows normal choroid plexuses (solid arrows) posteriorly. Some occipital cortex (open arrows) remains.

Transaxial view through the base shows a normal posterior fossa, including cerebellum.