Hyperglycemia-induced Hemiballism-hemichorea
- Usually due to nonketotic hyperglycemia secondary to diabetes mellitus, blood sugar levels generally above 200 mg/dl
- Good prognosis with treatment of diabetes
- Generally unilateral affecting caudate nucleus and putamen, hyperdense on non-contrast CT, high T1, some contrast enhancement, T2 images may be normal or show subtle high or low signal, MRS shows high lactate and low Cr
- Causes of MR abnormalities: presence of gemistocytes, microbleeds, calcium, demyelination, macrophages
