Extensive Cerebral Venous Sinus Thrombosis With Obstructive Hydrocephalus in a Young Female With Underlying Essential Thrombocythemia: A Case Report.

Persistent symptoms suggestive of idiopathic intracranial hypertension despite standard therapy should prompt urgent neuroimaging to exclude cerebral venous sinus thrombosis. When CVST is confirmed without an obvious provoking factor, evaluation for underlying myeloproliferative neoplasms, including JAK2-positive essential thrombocythemia, is essential.