"In this pattern, there is a diffuse presence of round microbleeds (punctate focal hypointensities) of similar size in the subcortical white matter (involving but not limited to the U-fibres), internal capsule, and the corpus callosum on T2* GRE or, more sensitively, SWI/SWAN images 1. The corona radiata and the non-subcortical centrum semiovale are relatively spared 1. The diffuse involvement of white matter, including outlining the subcortical fibres, resembles a walnut kernel."