Table 3.

Other causes of hyperdense/hyperintense striatal region on CT and T1-weighted MRI.

Imaging features	Disorder	Regions of involvement
Hyperdense on CT	Physiologic calcification	Bilateral GP, epiphysis, choroid plexus, habenular nucleus, cerebral falx
	Pathological calcification (Fahr's disease, parathyroid dysfunction)	Symmetrically bilateral CN, PN, GP, thalamus, dentate nuclei, and subcortical white matter
Hyperintense on T1-weighted MRI	Liver disease	Symmetrically bilateral GP; Substantia nigra
	Neurofibromatosis type 1	Bilateral GP
	Carbon monoxide	Bilateral GP; delayed leukoencephalopathy
	Parenteral nutrition	Symmetrically bilateral GP and thalamus

CT, computed tomography, MRI, magnetic resonance imaging, GP, globus pallidus, CN, caudate nucleus, PN, putamen nucleus.