Nine in ten people with<unk><unk><unk>  have a headache; this tends to worsen over the period of several days, but may also develop suddenly (thunderclap headache). The headache may be the only symptom. Many have symptoms of stroke: inability to move one or more limbs, weakness on one side of the face or difficulty speaking. The neurologic deficits related to central<unk> <unk>  does not necessarily affect one side of the body or one arterial or brain territory as is more common "arterial" strokes. Bilateral 6th cranial nerve palsies may occur, causing abnormalities related to eye movement, but this is rare. 40% of people have seizures, although it is more common in women who develop<unk><unk>  peripartum (in the period before and after giving birth). These are mostly seizures affecting only one part of the body and unilateral (occurring on one side), but occasionally the seizures are generalised and rarely they lead to status epilepticus (persistent or recurrent seizure activity for a long period of time). In the elderly, many of the aforementioned symptoms may not occur. Common symptoms in the elderly with this condition are otherwise unexplained changes in mental status and a depressed level of consciousness. The pressure around the brain may rise, causing papilledema (swelling of the optic disc) which may be experienced as visual obscurations. In severely raised intracranial pressure, the level of consciousness is decreased, the blood pressure rises, the heart rate falls and there is abnormal posturing. Focal neurologic deficits may occur hours to days after the headache in 50% of cases, this may present as hemiparesis (unilateral weakness) if due to infarction of the frontal or parietal lobe which are drained by the vein of Trolard. Focal deficits may also present as aphasia or confusion if the vein of Labbe (responsible for draining the temporal lobe) is affected.
Cerebral venous sinus thrombosis
Subarachnoid hemorrhage
Brain abscess
Cavernous sinus thrombosis
Amoebic brain abscess
Subdural empyema
Arachnoiditis
Pseudosubarachnoid hemorrhage