Subarachnoid hemorrhage with transient ischemic attack: another masquerader in cerebral venous thrombosis.

Cerebral venous thrombosis has a wide spectrum of clinical manifestations that may mimic many other neurological disorders and lead to frequent misdiagnoses or delay in diagnosis. The most frequent symptoms and signs are headache, seizures, focal deficits, and papilledema. A number of rare atypical manifestations have been described. Cerebral venous thrombosis may present with an isolated intracranial hypertension type picture, thunderclap headache, attacks of migraine with aura, isolated psychiatric disturbances, pulsatile tinnitus, isolated or multiple cranial nerve involvement, and occasionally as subarachnoid hemorrhage (SAH) or transient ischemic attack. Our patient presented with thunderclap headache and transient ischemic attack like episode with obvious SAH on CT scan. Acute SAH suggests the presence of a vascular lesion, such as ruptured aneurysm, and CVT is not generally considered in the diagnostic workup of SAH. The case emphasizes the importance of cerebral venous study in nonaneurysmal cases of SAH. It is important to have a high index of suspicion in such atypical cases to avoid delay in diagnosis.