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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.
Several conditions can result in a cerebrospinal fluid leak. For example, a patient may develop a CSF leak after sustaining a head injury. Leakage of the cerebrospinal fluid may occur after certain medical procedures. A leak may occur after a lumbar puncture, or spinal tap, which is a procedure in which a sample of the cerebrospinal fluid is drawn. In this case, the leakage occurs where the puncture was done. Some patients may develop a CSF leak after having surgery on the brain, spinal cord or head. Other causes of a cerebrospinal fluid leak include cervical bone spurs, epidural anesthesia and epidural steroid injections. A CSF leak can result in several different symptoms. Patients may have a headache, which MedlinePlus described as worsening when patients sit up, and improves when patients lie down.