Fig. 4

A case representing the walnut kernel microbleed pattern. SWI (a–d) MRI images at the level of the centrum semiovale (a), at the level of the corona radiata (b), at the level of the basal ganglia (c), and at the level of the brainstem and the cerebellum (d) of a 16-year-old polytraumatised female patient acquired on day 12 after hospital admission. SWI shows very high number of monotonous punctuate microbleeds in the subcortical white matter, the internal capsule, the corpus callosum, the cerebellum and the brainstem resembling a “walnut kernel”. The larger hypointensity visible in the right centrum semiovale and near the third ventricle is due to a ventricular drain (a–c)