<Li> obstruction to CSF flow and / or absorption can occur in hydrocephalus (blockage in ventricles or subarachnoid space at base of brain, e.g., by Arnold - Chiari malformation), extensive meningeal disease (e.g., infection, carcinoma, granuloma, or hemorrhage), or obstruction in cerebral convexities and superior sagittal sinus (decreased absorption). </Li> <Ul> <Li> increased CSF production can occur in meningitis, subarachnoid hemorrhage, or choroid plexus tumor . </Li> <Li> Idiopathic or unknown cause (idiopathic intracranial hypertension) </Li> <Li> craniosynostosis </Li> </Ul> <Li> increased CSF production can occur in meningitis, subarachnoid hemorrhage, or choroid plexus tumor . </Li> <Li> Idiopathic or unknown cause (idiopathic intracranial hypertension) </Li>

The first indication of brain compression from increasing intracranial pressure (icp) may be