Position of Cerebellar Tonsils in the Normal Population and in Patients with Chiari Malformation: A Quantitative Approach with MR Imaging

@article{Aboulezz1985PositionOC,
  title={Position of Cerebellar Tonsils in the Normal Population and in Patients with Chiari Malformation: A Quantitative Approach with MR Imaging},
  author={Amr Aboulezz and Klaus Sartor and Carl A. Geyer and Mokhtar H. Gado},
  journal={Journal of Computer Assisted Tomography},
  year={1985},
  volume={9},
  pages={1033–1036}
}
Magnetic resonance imaging was used to define quantitatively the position of the cerebellar tonsils in the normal population and in patients with Chiari malformations. The average distance of the tonsillar tips from the foramen magnum was 2.9 ± 3.4 mm above the foramen in 82 subjects without posterior fossa abnormality or increased intracranial pressure, and 10.3 ± 4.6 mm below the foramen in 13 patients with Chiari malformations (p < 0.005). Consequently, extension of the tonsils below the… 
Prevalence of Chiari I malformation and cerebellar ectopia in patients with pseudotumor cerebri
Morphometric and volumetric comparison of 102 children with symptomatic and asymptomatic Chiari malformation Type I.
TLDR
No clinically useful 2D or 3D measurements were identified that could reliably distinguish pediatric patients with symptoms attributable to Chiari malformation Type I from those with asymptomatic CM-I.
Distribution of cerebellar tonsil position: implications for understanding Chiari malformation.
TLDR
Cerebellar tonsil position follows an essentially normal distribution and varies significantly by age, which has implications for advancing the understanding of CM.
Advanced Imaging of Chiari 1 Malformations.
Diagnosis of Chiari I malformation and related syringomyelia: radiological and neurophysiological studies
TLDR
The authors review the pertinent literature on the neuroradiology of the Chiari I malformation, with special regard to MRI, with the aim of providing the reader with an updated instrument for its diagnosis.
Cerebellar tonsil ectopia measurement in type I Chiari malformation patients show poor inter-operator reliability
TLDR
The results demonstrated a large average range (7.7 mm) of measurements among the seven expert operators and support that, if economically feasible, two radiologists should make independent measurements before radiologic diagnosis of CM-I and surgery is contemplated.
Asymptomatic Chiari Type I malformations identified on magnetic resonance imaging.
TLDR
It is suggested that the isolated finding of tonsillar herniation is of limited prognostic utility and must be considered in the context of all available clinical and radiographic data.
Chiari I malformation redefined: clinical and radiographic findings for 364 symptomatic patients.
TLDR
These data support accumulating evidence that CMI is a disorder of the para-axial mesoderm that is characterized by underdevelopment of the posterior cranial fossa and overcrowding of the normally developed hindbrain.
Neuroradiological diagnosis of Chiari malformations
TLDR
MRI has a fundamental role in the correct identification of the anatomical aspects of this malformation and associated anomalies and represents the imaging modality of choice.
...
1
2
3
4
5
...