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.[1]

References
  1. Carpenter CR, Hussain AM, Ward MJ, Zipfel GJ, Fowler S, Pines JM, Sivilotti ML (September 2016). "Spontaneous Subarachnoid Hemorrhage: A Systematic Review and Meta-analysis Describing the Diagnostic Accuracy of History, Physical Examination, Imaging, and Lumbar Puncture With an Exploration of Test Thresholds". Academic Emergency Medicine. 23 (9): 963–1003. doi:10.1111/acem.12984. PMC 5018921. PMID 27306497.
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