Hyperthyroidism-induced Cerebral Venous Thrombosis Presenting as Chronic Isolated Intracranial Hypertension

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A 38-year-old woman with untreated Graves' disease was admitted to our hospital because of headache and diplopia for 3 months. A neuro-ophthalmic examination showed bilateral papilledema and abducens nerve paralysis. The cerebrospinal fluid pressure was extremely high. Brain magnetic resonance imaging showed cerebral venous thrombosis in the superior sagittal and right transverse and sigmoid sinuses. Laboratory investigations revealed elevated factor VIII and von Willebrand factor levels. The patient recovered after propylthiouracil and anticoagulation therapy. We herein report a rare case of cerebral venous thrombosis with hyperthyroidism presenting as chronic isolated intracranial hypertension. Hyperthyroidism can induce a hypercoagulable state and lead to venous thromboembolism.