Subarachnoid Hemorrhage

**Definition:** Bleeding into the intracranial or spinal SUBARACHNOID SPACE, most resulting from INTRACRANIAL ANEURYSM rupture. It can occur after traumatic injuries (SUBARACHNOID HEMORRHAGE, TRAUMATIC). Clinical features include HEADACHE; NAUSEA; VOMITING, nuchal rigidity, variable neurological deficits and reduced mental status.

**Tree numbers:** - C10.228.140.300.535.800 - C14.907.253.573.800 - C23.550.414.913.850

**Synonyms:** - Hemorrhage, Subarachnoid - SAH (Subarachnoid Hemorrhage)