[A Case of Cerebral Venous Sinus Thrombosis, Secondary to Subclinical Basedow Disease].

Cerebral venous sinus thrombosis(CVST)is a rare condition accounting for <1% of all strokes. It has been linked to a multitude of risk factors, including infections, oral contraceptive use, coronary disease, malignant disease, trauma, surgery, coagulopathy and several others. However, the association between hyperthyroidism and CVST is poorly understood. We describe here a rare case of CVST, secondary to subclinical Basedow disease. A 68-year-old woman with general fatigue, headache, speech disturbance and slow behavior was admitted to our hospital. Computed tomography(CT)and magnetic resonance imaging revealed a fresh infarction in the left temporal lobe, and CT angiography revealed filling defects of superior sagittal sinus and transverse sinus. Moreover, the patient was diagnosed with Basedow disease for the first time, by examination for tachycardia. This case suggests that it is essential to have a new awareness that hyperthyroidism is an important risk factor for CVST.