Spontaneous regression of cerebral arteriovenous malformation (AVM) is rare and poorly understood. We reviewed the clinical and angiographic findings in patients who had spontaneous regression of cerebral AVMs to determine whether common features were present. The clinical and angiographic findings of four cases from our series and 29 cases from the literature were retrospectively reviewed. The clinical and angiographic features analyzed were: age at diagnosis, initial presentation, venous drainage pattern, number of draining veins, location of the AVM, number of arterial feeders, clinical events during the interval period to thrombosis, and interval period to spontaneous thrombosis. Common clinical and angiographic features of spontaneous regression of cerebral AVMs are: intracranial hemorrhage as an initial presentation, small AVMs, and a single draining vein. Spontaneous regression of cerebral AVMs can not be predicted by clinical or angiographic features, therefore it should not be considered as an option in cerebral AVM management, despite its proven occurrence.

SUMMARYA cross‐sectional study was conducted on 160 Malaysian patients to validate the usefulness of the Siriraj Stroke Score (SSS) for differentiating intracerebral haemorrhage and infarction following acute strokes. Our results indicate that the score lacks sensitivity and specificity. It should thus not be used in epidemiological studies to determine stroke types in a community. More importantly, in the absence of information from neuroimaging of the brain, it cannot be used safely by physicians to assess the need or otherwise of thrombolytic and/or anticoagulant therapy after an acute stroke.