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Subarachnoid Hemorrhage. bleeding caused by a ruptured blood vessel just outside the brain (usually a ruptured cerebral aneurysm) that rapidly fills the space between the brain and skull (subarachnoid space) with blood; the patient may experience an intense, sudden headache accompanied by nausea, vomiting, and neck pain. Intracerebral Hemorrhage.
Spontaneous cerebrospinal fluid (CSF) leaks typically present with orthostatic headaches. Less commonly, spontaneous CSF leaks can present with other headache types. Nausea, vomiting, hearing disturbances, diplopia, back pain, and dizziness are not uncommon associated symptoms. Although the exact cause of CSF leaks often remains uncertain, some patients may be predisposed due to disorders of connective tissue or spinal meningeal anomalies. When a spontaneous CSF leak is suspected, head MRI with contrast is ordinarily the first study to obtain.