Eight older women from two different continents, all with nonketotic hyperg
lycemia, presented with hemiballismus-hemichorea (HB-HC) and high signal in
tensity in the contralateral striatum on T1-weighted MRI scans. Correction
of underlying hyperglycemia and supportive care resulted in resolution with
in days to weeks. This characteristic clinicoradiologic picture suggests a
clinical syndrome with benign outcome.