Which term is defined as collection of blood within the subarachnoid space?

Which term is defined as collection of blood within the subarachnoid space?

• A. Tourette syndrome
• B. Sciatica
• C. Subdural hematoma
• D. Subarachnoid hemorrhage

Answer: (D)

Blood in the subarachnoid space refers to a subarachnoid hemorrhage. The subarachnoid space sits between the arachnoid and pia mater and surrounds the brain and spinal cord; when bleeding occurs into that space, it’s an emergency condition often caused by a ruptured intracranial aneurysm or head injury. This bleeding typically presents with a sudden, severe head pain described as “thunderclap,” along with neck stiffness, sensitivity to light, and sometimes nausea or loss of consciousness. Quick diagnosis is crucial, usually starting with a CT scan; if a CT is inconclusive but suspicion remains high, a lumbar puncture can detect blood breakdown products indicating hemorrhage. It differs from a subdural hematoma, which is bleeding between the dura and arachnoid layers, and from conditions like Tourette syndrome or sciatica, which involve neurological symptoms but not bleeding into the brain’s protective spaces.

Blood in the subarachnoid space refers to a subarachnoid hemorrhage. The subarachnoid space sits between the arachnoid and pia mater and surrounds the brain and spinal cord; when bleeding occurs into that space, it’s an emergency condition often caused by a ruptured intracranial aneurysm or head injury. This bleeding typically presents with a sudden, severe head pain described as “thunderclap,” along with neck stiffness, sensitivity to light, and sometimes nausea or loss of consciousness. Quick diagnosis is crucial, usually starting with a CT scan; if a CT is inconclusive but suspicion remains high, a lumbar puncture can detect blood breakdown products indicating hemorrhage. It differs from a subdural hematoma, which is bleeding between the dura and arachnoid layers, and from conditions like Tourette syndrome or sciatica, which involve neurological symptoms but not bleeding into the brain’s protective spaces.