MRI features of a slit ventricle syndrome in a child known for NF1 and who had a VP shunt for an obstructive hydrocephalus due to a hypothalamic glioma.

One of the aetiopathogenic explanation of the slit ventricle syndrome is an intermittent ventricular isolation, in which one overdrained ventricle collapses and occludes the shunt catheter resulting in under-drainage of the contralateral ventricle (as in this case).