A 37-year-old Korean woman was admitted at 31 weeks gestation with exertion
al dyspnea. Three years ago she was diagnosed as having Graves' disease. Th
yrotoxicosis-induced dilated cardiomyopathy was diagnosed by echocardiograp
hy. During management, a first attack of seizure occurred. Brain MRI and MR
A showed occlusion of both internal carotid arteries, which confirmed the d
iagnosis of Moyamoya disease. Coexistence of dilated cardiomyopathy in thyr
otoxicosis and Moyamoya disease is rare and the pathogenic correlation is d
iscussed. (C) 2001 Elsevier Science Ireland Ltd. All rights reserved.