In cases of acute hemorrhage or neurological decline, obvious need for immediate neurosurgical consultation
If patient presents with headache or seizure and lesion is then found, may simply warrant outpatient neurosurgical evaluation
Arteriovenous malformation 
Venous angioma
Cerebral venous thrombosis
Cavernous malformation
Coma
Capillary telangiectasia
Brain abscess
Intracranial hemorrhage