Incidence of basioccipital hypoplasia in Chiari malformation Type I: comparative morphometric study of the posterior cranial fossa

Noudel, R.; Jovenin, Nicolas; Eap, Cristophe; Scherpereel, B; Piérot, Laurent; Rousseaux, P

doi:10.3171/2009.2.jns08284

Cited by 98 publications

(86 citation statements)

References 31 publications

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“…PCF volumes measured by use of the automated method and with manual delineation were found to be similar, 196.2 ± ± 8.7 vs. 196.9 ± 11.0 cm 3 , respectively. The mean PCF volumes previously reported in CT and magnetic resonance-based measurements of 186 cm 3 by Nishikawa et al [7], 174 ± 25 cm 3 by Noudel et al [8] and 166 ± 8 cm 3 by Milhorat et al [5] and 165.57 ± ± 19.37 cm 3 by Vurdem et al [11]. As for our finding, PCF volume was 100.91 cm 3 .…”

Section: Case Reportsupporting

confidence: 75%

“…Recently, morphometric studies have clearly shown significantly smaller volume or underdeveloped bony parts of the PCF in adults [1][2][3]5]. A significant smaller basiocciput in CMI group was demonstrated by Noudel et al [8], but no significant difference was found in the length of the supraocciput and FM. No significant difference in the length of the clivus, basiocciput and spheniocciput between the CMI and the control group was reported by Nishikawa et al [7].…”

Section: Case Reportmentioning

confidence: 89%

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Chiari type I malformation with high foramen magnum anomaly

et al. 2015

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Section: Case Reportsupporting

confidence: 75%

Section: Case Reportmentioning

confidence: 89%

Chiari type I malformation with high foramen magnum anomaly

et al. 2015

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“…1,8,10,12,28 It is likely that patients with CM-I have a reduced posterior fossa volume, which results in crowding at the foramen magnum. 6,21,25,27 Although cerebellar tonsil position is a convenient marker for crowding at the foramen magnum, the correlation is not exact. 26 In some cases, patients with < 5 mm of descent can have a clinical presentation of Chiari syndrome and even syringomyelia caused by crowding at the foramen magnum.…”

Section: Discussionmentioning

confidence: 99%

Impact of body mass index on cerebellar tonsil position in healthy subjects and patients with Chiari malformation

Smith¹,

Strahle²,

Kazarian³

et al. 2015

JNS

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OBJECT It is unclear if there is a relationship between Chiari malformation Type I (CM-I) and body mass index (BMI). The aim of this study was to identify the relationship between BMI and cerebellar tonsil position in a random sample of people. METHODS Cerebellar tonsil position in 2400 subjects from a cohort of patients undergoing MRI was measured. Three hundred patients were randomly selected from each of 8 age groups (from 0 to 80 years). A subject was then excluded if he or she had a posterior fossa mass or previous posterior fossa decompression or if height and weight information within 1 year of MRI was not recorded in the electronic medical record. RESULTS There were 1310 subjects (54.6%) with BMI records from within 1 year of the measured scan. Of these subjects, 534 (40.8%) were male and 776 (59.2%) were female. The average BMI of the group was 26.4 kg/m2, and the average tonsil position was 0.87 mm above the level of the foramen magnum. There were 46 subjects (3.5%) with a tonsil position ≥ 5 mm below the level of the foramen magnum. In the group as a whole, there was no correlation (R2 = 0.004) between BMI and cerebellar tonsil position. CONCLUSIONS In this examination of 1310 subjects undergoing MRI for any reason, there was no relationship between BMI and the level of the cerebellar tonsils or the diagnosis of CM-I on imaging.

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“…134 Children with CM often have a smaller than normal posterior fossa volume, resulting in crowding of the posterior fossa and foramen magnum contents. [142][143][144] This crowding at the foramen magnum may be appreciated on sagittal MRI by the typical "pegshaped" appearance of the cerebellar tonsils. Because "crowding" is difficult to quantify or objectively determine, the diagnosis of CM on imaging is usually made by a determination of cerebellar tonsil position on MRI.…”

Section: Chiari and Syringomyeliamentioning

confidence: 99%

Incidental Findings on Brain and Spine Imaging in Children

Maher¹,

Piatt²,

Ragheb³

et al. 2015

Pediatrics

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In recent years, the utilization of diagnostic imaging of the brain and spine in children has increased dramatically, leading to a corresponding increase in the detection of incidental findings of the central nervous system. Patients with unexpected findings on imaging are often referred for subspecialty evaluation. Even with rational use of diagnostic imaging and subspecialty consultation, the diagnostic process will always generate unexpected findings that must be explained and managed. Familiarity with the most common findings that are discovered incidentally on diagnostic imaging of the brain and spine will assist the pediatrician in providing counseling to families and in making recommendations in conjunction with a neurosurgeon, when needed, regarding additional treatments and prognosis.

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Incidence of basioccipital hypoplasia in Chiari malformation Type I: comparative morphometric study of the posterior cranial fossa

Cited by 98 publications

References 31 publications

Chiari type I malformation with high foramen magnum anomaly

Chiari type I malformation with high foramen magnum anomaly

Impact of body mass index on cerebellar tonsil position in healthy subjects and patients with Chiari malformation

Incidental Findings on Brain and Spine Imaging in Children

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