Subarachnoid hemorrhage

Subarachnoid hemorrhage (SAH) is bleeding into the subarachnoid space—the area between the arachnoid membrane and the pia mater which surrounds the brain.

Symptoms may include a severe headache, vomiting, loss of consciousness, fever, and sometimes seizures. Neck stiffness or neck pain are also common.

Subarachnoid Hemorrhage Media

• 

  Circle of Willis with the most common locations of ruptured aneurysms marked

• 

  A lumbar puncture in progress. A large area on the back has been washed with an iodine-based disinfectant, leaving brown coloration.

• 

  Xanthochromia versus normal CSF

• 

  ECG changes resembling those of an STEMI in a woman who had an acute CNS injury from a subarachnoid hemorrhage

• 

  Arteriogram showing a partially coiled aneurysm (indicated by yellow arrows) of the posterior cerebral artery with a residual aneurysmal sac. The person was a 34-year-old woman initially treated for a subarachnoid hemorrhage.

• 

  Average number of people with SAH per 100,000 person-years, broken down by age