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Related Concept Videos

Cranial Bones: Superior and Posterior View01:14

Cranial Bones: Superior and Posterior View

The superior view of the cranium shows the frontal and paired parietal bones.
The frontal bone is the single bone that forms the forehead. At its anterior midline, between the eyebrows, there is a slight depression called the glabella. The frontal bone also forms the supraorbital margin of the orbit. Near the middle of this margin is the supraorbital foramen, the opening that provides passage for a sensory nerve to the forehead. The frontal bone is thickened just above each supraorbital margin,...
Increased Intracranial Pressure l: Introduction01:14

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...
Increased Intracranial Pressure ll: Pathophysiology01:29

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...
Cranial and Spinal Meninges01:19

Cranial and Spinal Meninges

The cranial and spinal meninges are complex protective structures surrounding the central nervous system (CNS), consisting of the brain and spinal cord. These meninges consist of the dura mater, the arachnoid mater, and the pia mater. They protect the CNS, provide structural support, and aid in circulating cerebrospinal fluid (CSF).
Cranial Meninges
These meningeal layers cover the cranium. The dura mater is the outermost layer of cranial meninges. It is a thick and durable membrane of dense...
Articulations of the Vertebral Column01:28

Articulations of the Vertebral Column

In addition to being held together by the intervertebral discs, adjacent vertebrae also articulate with each other at synovial joints formed between the superior and inferior articular processes called zygapophysial joints (facet joints). These are plane joints that provide for only limited motions between the vertebrae. The orientation of the articular processes at these joints varies in different regions of the vertebral column and serves to determine the types of motions available in each...

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Updated: May 23, 2026

Endoscopic Endonasal Trans-sphenoidal Approach: Minimally Invasive Surgery for Pituitary Adenomas
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Chiari III malformation with proatlas abnormality.

Kanwaljeet Garg1, Vivek Tandon, Ashok K Mahapatra

  • 1Department of Neurosurgery, All India Institute of Medical Sciences, New Delhi, India.

Pediatric Neurosurgery
|March 30, 2012
PubMed
Summary

Chiari III malformations are rare hindbrain defects. This case highlights a rare association with occipital condyle hypoplasia, offering insights into these complex conditions.

Area of Science:

  • Neuroscience
  • Developmental Biology
  • Medical Genetics

Background:

  • Chiari III malformations are severe hindbrain developmental anomalies.
  • These malformations are characterized by occipital or cervical encephalocele and associated neural tube defects.
  • High early mortality and severe neurological deficits are common in affected individuals.

Observation:

  • This report details an extremely rare case of Chiari III malformation.
  • The patient presented with an occipital encephalocele and occipital condyle hypoplasia.
  • This specific combination, particularly with proatlas abnormality, is exceptionally uncommon.

Findings:

  • The study describes a unique presentation of Chiari III malformation.
  • Occipital condyle hypoplasia was identified as a co-occurring anomaly.

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  • This case expands the known spectrum of Chiari III malformation presentations.
  • Implications:

    • Understanding rare Chiari III malformation variants is crucial for diagnosis and management.
    • This case may inform future research into the genetic and developmental underpinnings of hindbrain malformations.
    • Further investigation into associated skeletal anomalies like occipital condyle hypoplasia is warranted.