Objectives: Subarachnoid hemorrhage (SAH) with negative angiographic findings has a heterogeneous nature with variations in clinical course and outcome as compared to the aneurysmal SAH. It makes up to 15% of the spontaneous SAH and is characterized by milder clinical presentation. The purpose of this study was the analyses of risk factors, clinical observations, radiologic characteristics, and outcome in patients with nonaneurysmal SAH (NA-SAH). Patients and Methods: In a retrospective design, 77 consecutive patients with NA-SAH were recruited from May 2008, to October 2018. All patients underwent conventional cerebral angiography. We stratified patients into two groups based on the distribution of blood on their CT scan into perimesencephalic (PM) and non-PM (NPM) SAH. We performed the Outcome using Glasgow Coma Scale (GCS) and modified Rankin scale (favorable mRS 0–2 vs. unfavorable mRS 3–6). Data were analyzed using IBM® SPSS® Statistics V22.0. Results: The mean age at presentation was 48.5 ± 8.4 years with male predominance (71.4%). About 76.7% of the patients had headache and vomiting, most of the patients (75.3%) presented with GCS 15 at initial clinical presentation (61.03%) had NPM versus (38.96%) with PM characters in computed tomography scans. Fourteen (17.9%) patients developed hydrocephalus and 12 (15.3%) needed external ventricular drain placement, while none of the patients needed permanent shunt placement. However, all patients had a favorable clinical and functional outcome at discharge and at late follow-up (up to 3 months). Conclusions: NA-SAH does not affect the short- and long-term prognosis. In our results, the pattern of bleeding affects the initial presentation, clinical course, and complications. The clinical and functional outcomes in the majority of our patients were comparable in both groups with good prognosis. Hypertension, smoking, and elevated venous pressure, such as a history of deep venous thrombosis and asthma might be considered as a risk factor.

Cavernous angioma, cavernoma, cavernous hemangioma, also called cerebral cavernous malformation (when present in the brain), are benign vascular malformations, usually intraparenchymal; however, a few reported cases are in the extra-axial location—as middle cranial fossa, near the cavernous sinuses, and in the cerebellopontine angle—and are rarely reported as dura-based convexity lesion resembling meningioma. We report a giant dura-based, convexity, a cerebral cavernous malformation. We wish to notify the case as occurring at a rare location and a large-sized cerebral cavernous malformation. A case of young female presented with a long-standing history of headache. Computed tomography scan and magnetic resonance imagings (MRIs) suggested right occipital dura-based large mass lesion of approximately 5 cm in diameter. The lesion was excised and pathology studies confirmed the diagnosis of a cerebral cavernous malformation. A follow-up MRI confirmed total resection of the lesion and the patient had a smooth postoperative recovery.