BACKGROUND Only 8% to 22% of cases of subarachnoid hemorrhage (SAH) are of nonaneurysmal origin. Among these, perimesencephalic nonaneurysmal SAH is a distinct clinical and radiologic entity with normal angiographic findings and a good prognosis. In contrast, SAH of nonaneurysmal origin occurring along the cortical convexity is rare and poorly understood. We report 2 cases of subarachnoid hemor...

Background ̶Subarachnoid hemorrhage (SAH) remains a disease without any definitive treatment options. Research, to date, has concentrated on the pathophysiology of vasospasm. Recent evidence supports the concept of Early Brain Injury (EBI), a phenomena which may help to explain the complex pathophysiology seen in patients after a SAH. Summary ̶EBI aims to describe the pathophysiological events th...

In patients with high-grade atherosclerotic stenosis or occlusion of the extracranial cerebral arteries, subarachnoid hemorrhage (SAH) may occur, potentially due to rupture of fragile dilated pial collateral vessels. This association has been well described in Moyamoya disease. There are only few cases in the literature that reported SAH due to bilateral carotid artery stenosis but intraventric...

OBJECTIVE The objective of this study is to verify the relationship between subarachnoid hemorrhage (SAH) volume (not Fisher grade) and development of cerebral vasospasm prospectively. METHODS Patients who visited our hospital with a diffuse or localized thick subarachnoid blood clot seen on computed tomography (CT), taken within 48 hours after SAH and the aneurysm was confirmed by CT Angiogr...

Subarachnoid Hemorrhage (SAH) is most commonly caused by trauma, aneurysms, other vascular lesions, and infrequently malignant tumors such as gliomas or metastasis; however, benign intracranial tumors such as meningiomas or schwannomas are an uncommon cause. Vestibular schwannomas, accounting for approximately 8% of all intracranial tumors and 80% of Cerebellopontine Angle (CPA) neoplasms are t...

Delayed ischemic neurological deficit (DIND) and delayed cerebral infarction (DCI) are the most important postoperative risk factors for poor outcome after aneurysmal subarachnoid hemorrhage (SAH) [1]. Aneurysmal SAH is associated with a total mortality of estimately 50% including patients who die before admission to a hospital. In spite of new diagnostic tools, modern intensive care therapy an...

BACKGROUND AND PURPOSE Reactive oxygen species (ROS) are thought to be primary in the pathogenesis of cerebral vasospasm after subarachnoid hemorrhage (SAH). However, as direct evidence of ROS has not yet been demonstrated in cerebral vasospasm, we sought to substantiate superoxide anion (.O(2)(-)) generation in the subarachnoid space after SAH using a modification of Karnovsky's manganese/diam...

Abnormal cerebral vasculature can be a manifestation of a vascular malformation or a neoplastic process. We report the case of a patient with angiography-negative subarachnoid hemorrhage (SAH) who re-presented 3 years later with a large intraparenchymal hemorrhage. Although imaging following the intraparenchymal hemorrhage was suggestive of arteriovenous malformation, the patient was ultimately...

RCVS: Reversible Cerebral Vasoconstriction Syndrome; rtPA: recombinant tissue Plasminogen Activator; GCS: Glasgow Coma Scale; CT: Computed Tomography; ICH: Intracerebral Hemorrhage; MRI: Magnetic Resonance Imaging; MRR: MR Renography; ACA: Anterior Cerebral Artery; MIS: Minimally Invasive Surgery; TCD: Transcranial Doppler; ICU: Intensive Care Unit; MISTIE: Minimally Invasive Surgery plus rt-PA...