MRI
Ill-defined T1 hypointense and T2/FLAIR hyperintense signal with patchy enhancement and restricted diffusion is seen at the left cerebellum involving the left cerebellar vermis. Associated with mass effect onto fourth ventricle, adjacent basal cisterns and effacement of the adjacent left cerebellar folia. Inferior descent of the cerebellar tonsils below foramen magnum.
Blooming artefact on SWI sequence is noted within left cerebellar lesion and right parieto-temporo-occipital region, likely haemosiderin deposits.
No significant midline shift. Bilateral lateral and third ventricles are dilated in keeping with acute hydrocephalus.
Area of T1 low signal intensity and T2 high signal with almost signal suppression on FLAIR sequence and no enhancement is seen at right parieto-temporo-occipital region in keeping with encephalomalacia. No restricted diffusion.
T1 hypointense and T2/ FLAIR hyperintense gliosis with no enhancement and no restricted diffusion is observed at the left frontal lobe.
Subtle T1 hypointense and T2/ FLAIR hyperintense lesion with no enhancement and no restricted diffusion is seen at the right sided medulla oblongata.