Thunderclap headache with neck stiffness and loss of consciousness is most concerning for which diagnosis?

Thunderclap headache with neck stiffness and loss of consciousness is most concerning for which diagnosis?

• A. Brain tumor
• B. Migraine with aura
• C. Meningitis
• D. Subarachnoid hemorrhage

Answer: (D)

This presentation points to subarachnoid hemorrhage. A thunderclap headache—sudden and reaches maximal intensity within seconds to a minute—is classic for acute bleeding into the subarachnoid space, most often from rupture of a cerebral aneurysm. The blood in the subarachnoid space irritates the meninges, causing neck stiffness (nuchal rigidity). Loss of consciousness can occur with a large or rapidly progressing bleed due to abrupt rise in intracranial pressure or brain ischemia. Headache from a brain tumor tends to be gradual, progressive, and may feature focal deficits rather than an explosive onset. Migraine with aura usually presents with a unilateral throbbing pain and reversible neurological symptoms (aura) that develop over minutes, not a sudden thunderclap, and neck stiffness is not a typical feature. Meningitis can cause neck stiffness and altered mental status, but it commonly presents with fever and a more subacute progression rather than an abrupt, maximal headache. In this scenario, the sudden, severe onset with meningeal irritation best fits a subarachnoid hemorrhage. If suspected, pursue urgent noncontrast head imaging and neurosurgical evaluation promptly.

This presentation points to subarachnoid hemorrhage. A thunderclap headache—sudden and reaches maximal intensity within seconds to a minute—is classic for acute bleeding into the subarachnoid space, most often from rupture of a cerebral aneurysm. The blood in the subarachnoid space irritates the meninges, causing neck stiffness (nuchal rigidity). Loss of consciousness can occur with a large or rapidly progressing bleed due to abrupt rise in intracranial pressure or brain ischemia.

Headache from a brain tumor tends to be gradual, progressive, and may feature focal deficits rather than an explosive onset. Migraine with aura usually presents with a unilateral throbbing pain and reversible neurological symptoms (aura) that develop over minutes, not a sudden thunderclap, and neck stiffness is not a typical feature. Meningitis can cause neck stiffness and altered mental status, but it commonly presents with fever and a more subacute progression rather than an abrupt, maximal headache.

In this scenario, the sudden, severe onset with meningeal irritation best fits a subarachnoid hemorrhage. If suspected, pursue urgent noncontrast head imaging and neurosurgical evaluation promptly.