A 73-year-old man presented with a thunderclap headache (TCH), suggesting a subarachnoid haemorrhage. Neurological examination, computer tomography of the head, and cerebrospinal fluid examination were normal. Magnetic resonance imaging of the brain revealed a supratentorial cerebral infarct. No cerebral aneurysm could be detected. A TCH can be the presenting feature of many conditions. A formula for the diagnostic assessment of TCH should be established. The management of this type of headache is controversial. Articles differ in their conclusions and recommendations. An expansion of routine investigations should be performed in cases where the neurological examination, cerebrospinal fluid analysis, and computer tomography are normal. A TCH can be the primary clinical feature of a supratentorial cerebral infarct.
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