What comprises the basal ganglia?
Basal ganglia are grey matter nuclei deep in the cerebral hemispheric white matter. They comprise: caudate nucleus, lentiform nucleus (putamen and globus pallidus), internal capsule, claustrum, external capsule, and amygdala.
Diffusion-weighted MRI images show the bright signal in the left MCA circulation territory, consistent with an acute infarct.
MRA sequences in coronal and axial planes show a short-segment abruption of the proximal left MCA M2 branches, with attenuation in calibre of the M2 and M3 segments, with visualisation of fewer opercular and sylvian branches of the distal M3. These findings are highly suggestive of a thromboembolic episode.