The left centrum semiovale lesion shows a rim of fluid signal with central low T2 and high FLAIR signal punctate focus without enhancement. Peripheral diffusion signal and elongated appearance in the periventricular location are highly suspicious for demyelination.
When compared to the prior study, the ventricular size has remained similar to previous. Prior right frontal instrumentation tract. Defect to the floor of the third ventricle keeping with prior endoscopic further ventriculostomy. CSF flow is demonstrated through the ventriculostomy. The previously demonstrated right frontal meningoencephalocoele appears similar to previous. New focus of FLAIR hyperintensity in the left centrum semiovale surrounding a central ring of low FLAIR signal, without diffusion signal however no definite restriction is seen. No abnormal susceptibility artefact.