Cerebral edema, altered mental status, seizures, acute stroke, leptomeningeal metastases, and paraneoplastic syndrome. 
Neurologic symptoms commonly occur in oncology patients, and in some cases they may be the presenting symptom of malignancy.  Cancer-related neurologic syndromes are rarely pathognomonic and must be differentiated from other benign or serious conditions.  This article reviews common neuro-oncologic syndromes that may lead to urgent evaluation in the emergency department, including cerebral edema, altered mental status, seizures, acute stroke, leptomeningeal metastases, and paraneoplastic neurologic syndromes.