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Updated: Jun 27, 2026

Pre-Chiasmatic, Single Injection of Autologous Blood to Induce Experimental Subarachnoid Hemorrhage in a Rat Model
Published on: June 18, 2021
Thunderclap headache without subarachnoid hemorrhage associated with regrowth of previously coil-occluded aneurysms
E P Byrum1, J M McGregor, G A Christoforidis
1Department of Radiology, Ohio State University Medical Center, Columbus, Ohio 43210, USA.
Abstract:
Thunderclap headache is a sudden, high-intensity headache often associated with subarachnoid hemorrhage secondary to a ruptured intracerebral aneurysm. A variety of less common causes have now been described. This report presents the cases of 2 patients who experienced thunderclap headache after regrowth of an aneurysm, without hemorrhage of previously coiled aneurysms. Thunderclap headache after endovascular occlusion of a ruptured intracranial aneurysm may be a symptom of aneurysm regrowth and may warrant angiographic investigation.
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