Fig. 2.

Second brain MRI performed at 23 months. While there is some coexistent cerebral volume loss, the sagittal T1W and axial T2W images show macrocrania, dilatation of the lateral, third and fourth ventricles with transependymal oedema (closed arrowheads) and some bulging of the inferior recesses of the third ventricle in keeping with extraventricular hydrocephalus. The pons and medulla are displaced posteriorly, the inferior cerebellar vermis superiorly and there are new extra-axial cystic lesions within the ambient cisterns, larger on the right (open arrowhead) in keeping with loculated fluid within the arachnoid space