The clinician should first rule out conditions with similar symptoms, such as subarachnoid hemorrhage, ischemic stroke, pituitary apoplexy, cerebral artery dissection, meningitis, and spontaneous cerebrospinal fluid leak. This may involve a CT scan, lumbar puncture, MRI, and other tests. Posterior<unk>  encephalopathy syndrome has a similar presentation, and is found in 10–38% of<unk>  patients.<unk>  is diagnosed by detecting diffuse<unk>  cerebral<unk> . Catheter angiography is ideal, but computed tomography angiography and magnetic resonance angiography can identify about 70% of cases. Multiple angiographies may be necessary. Because other diseases (such as atherosclerosis) have similar angiographic presentations, it can only be conclusively diagnosed if<unk>  resolves within 12 weeks.
Reversible cerebral vasoconstriction syndrome
Cerebral hyperperfusion syndrome
Brain fag syndrome
Intracranial hypertension syndrome
Cerebral vasospasm
Thrombotic storm
Posterior cerebral artery syndrome
Middle cerebral artery syndrome