Diseases that cause meningeal irritation, usually without focal or lateralizing neurologic signs. CT Scan or MRI maybe normal or abnormal.
1. Subarachnoid hemorrhage.
2. Meningitis.
3. Encephalitis
Diseases that cause focal or lateralizing neurologic signs. CT scan and MRI usually abnormal.
1. Brain hemorrhage or massive infarction.
2. Brainstem infarction.
3. Brain abscess.
4. Epidural and subdural hemorrhage, [...]

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Diseases that cause no focal or lateralizing neurologic signs, usually with normal brainstem functions.
CT scan and cellular content of the CSF are normal.
1. Intoxication.
Alcohol, barbiturates, sedative, opiates.
2. Metabolic disturbances.
Anoxia, diabetic acidosis, hypoglycemia, uremia, hepatic failure, hypo and hypernatremia, profound nutritional deficiency.
3. Severe systemic [...]

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