Related Experiment Video
Updated: May 21, 2026

04:34
Surgical Treatment of an Endolymphatic Sac Tumor
Published on: May 26, 2023
Papilloedema due to Chiari I malformation
Jason Chao Zhang1, Belal Bakir, Andrew Lee
1Ophthalmology Department, The Methodist Hospital, Houston, Texas, United States.
BMJ Case Reports
|June 8, 2012
Summary
Chiari I malformation, a condition causing cerebellar tonsil displacement, can rarely manifest as papilledema. This case highlights papilledema as the sole neurological symptom in an adult female with Chiari I.
Area of Science:
- Neurology
- Ophthalmology
- Neurosurgery
Background:
- Chiari I malformation involves cerebellar tonsil displacement into the cervical spine.
- Ocular manifestations are known but papilledema is rare.
Observation:
- A 64-year-old female presented with papilledema as her only neurological symptom.
- Her condition was diagnosed as Chiari I malformation.
Findings:
- Papilledema can be an isolated presenting sign of Chiari I malformation.
- This presentation mimics idiopathic intracranial hypertension.
Implications:
- Highlights the importance of considering Chiari I malformation in adult papilledema cases.
- May alter diagnostic pathways for papilledema.
Related Concept Videos
Cerebral Edema ll: Pathophysiology
Vasogenic edema is a major form of cerebral edema characterized by abnormal accumulation of fluid in the brain’s extracellular space due to disruption of the blood–brain barrier (BBB). The BBB is a specialized structure composed of endothelial cells connected by tight junctions, supported by astrocytic endfeet and a basement membrane. Under normal conditions, it tightly regulates the movement of ions, proteins, and solutes between the bloodstream and brain parenchyma. When this barrier loses...
Increased Intracranial Pressure ll: Pathophysiology
Increased intracranial pressure (ICP) refers to a potentially life-threatening rise in pressure inside the skull. This usually happens when there is a major change in the volume of brain tissue, blood, or cerebrospinal fluid (CSF) — the three components inside the skull. According to the Monro-Kellie doctrine, if the volume of one component increases, the volumes of the other components must decrease to maintain normal pressure. If this does not happen, ICP rises.The process often begins with...
Increased Intracranial Pressure l: Introduction
Intracranial hypertension is a sustained elevation of intracranial pressure (ICP) above 22 mm Hg. In supine adults, normal ICP is ~7–15 mm Hg.The rigid, nonexpandable cranium contains three components—brain tissue, blood, and cerebrospinal fluid (CSF)—that total ~1,700 mL in a typical adult: 1,400 mL brain (~80%), 150 mL blood (~10%), and 150 mL CSF (~10%). According to the Monro–Kellie doctrine, total intracranial volume is effectively fixed. When one component expands, CSF and venous blood...
Cerebral Edema l: Introduction
Cerebral edema is a pathological increase in brain water content that disrupts intracranial pressure regulation and impairs neurological function. Because the cranial vault is rigid, even modest increases in tissue volume can compromise cerebral perfusion, distort neural structures, and initiate secondary injury. Cerebral edema develops through four principal mechanisms: vasogenic, cytotoxic, interstitial, and ionic.Vasogenic EdemaVasogenic edema arises from disruption of the blood–brain...
Glaucoma: Overview
Glaucoma is an eye condition characterized by increased intraocular pressure that damages the retina and optic nerve, leading to irreversible blindness if left untreated. The human eye has various components, including the cornea, iris, pupil, lens, and optic nerve. Aqueous humor is secreted by the epithelium of the ciliary body in the posterior chamber and flows through the trabecular meshwork and canal of Schlemm, maintaining normal intraocular pressure. The trabecular meshwork and the canal...
Cytotoxic Edema: Pathophysiology
Cytotoxic edema is a form of cerebral edema characterized by intracellular swelling of neurons, astrocytes, and other glial cells. It develops when the mechanisms responsible for maintaining ionic gradients across the cell membrane become impaired. Under normal physiological conditions, the sodium–potassium ATPase actively transports sodium ions out of the cell and potassium ions into the cell, preserving osmotic balance and enabling electrical signaling. This pump requires a continuous supply...
