Raised intracranial pressure with upright posture.

We describe the phenomenon of paradoxical intracranial hypertension with upright posture with normal recumbent intracranial pressure (ICP). This effect was measured by direct ICP monitoring in a patient who had a lumboperitoneal shunt for idiopathic intracranial hypertension. Bilateral subtemporal surgical decompression to increase intracranial compliance with confirmatory perioperative pressure monitoring was central to the successful management of this patient.

Spinal cord infarction complicating acute hydrocephalus secondary to a colloid cyst of the third ventricle. Case report.

Occipital lobe infarction secondary to tentorial herniation is a rare but well-recognized complication of posterior cerebral artery interruption during acute hydrocephalus; however, a similar event in which tonsillar herniation leads to symptomatic occlusion of the anterior spinal arteries (ASAs) has not been reported. The authors present the case of a third ventricular colloid cyst in a previously healthy 24-year-old man who presented with symptoms and signs of critically raised intracranial pressure. He subsequently survived the ictus of insults following emergency external cerebrospinal fluid drainage and definitive resection of the colloid cyst, but he sustained occipital lobe and spinal cord infarction despite the absence of systematic hypotension.