<prompt> In benign intracranial hypeension-here is a restriction of upgazeNormal ventricles is found in 50 of casesBrain scan in impoant in young woman to exclude sagittal sinus thrombosisOptic nerve fenestration should be performed early before the Vision is affected  <response>: Dural sinus thrombosis DST is a life threatening illness and is often overlooked but it must be considered in the differential diagnosis of a patient presenting with a significant headache. DST presents similarly to benign intracranial hypeension BIH with intracranial hypeension and headache. A case of a 23 year old woman with DST is described that was initially diagnosed as BIH. Brain CT scan and MRI scan should be taken to distinguish from sinus thrombosis and benign intracranial hypeension Ref Harrison20th edition pg 2455 