Asymptomatic Chiari Type I malformations identified on magnetic resonance imaging

Meadows, Jeffery; Kraut, Michael A.; Guarnieri, Michael; Haroun, Raymond I.; Carson, Benjamin S.

doi:10.3171/jns.2000.92.6.0920

Cited by 476 publications

(321 citation statements)

References 51 publications

(84 reference statements)

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“…This prevalence contrasts sharply with that reported by Meadows et al, who reviewed the brain and cervical-spine MRIs of 22,591 patients. They could identify only 175 patients in whom tonsillar ectopia exceeded 5 mm, i.e., a prevalence of 0.77% [36].…”

Section: Discussionmentioning

confidence: 99%

Clinical evidence for cervical myelopathy due to Chiari malformation and spinal stenosis in a non-randomized group of patients with the diagnosis of fibromyalgia

et al. 2004

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Section: Discussionmentioning

confidence: 99%

Clinical evidence for cervical myelopathy due to Chiari malformation and spinal stenosis in a non-randomized group of patients with the diagnosis of fibromyalgia

et al. 2004

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“…139,140,151 If the current imaging definition of tonsils 5 mm below the foramen magnum is used, CM is not rare. 78,[138][139][140]153,154 CM is found in approximately 0.8% to 1% of all patients undergoing MRI when age is not considered. 78,138,153 When prevalence is stratified by age, it is clear that the prevalence in children and young adults is greater.…”

Section: Chiari and Syringomyeliamentioning

confidence: 99%

“…78,[138][139][140]153,154 CM is found in approximately 0.8% to 1% of all patients undergoing MRI when age is not considered. 78,138,153 When prevalence is stratified by age, it is clear that the prevalence in children and young adults is greater. 152 As many as 3.6% of children undergoing MRI of the brain or cervical spine have CM by imaging criteria; most children who meet the definition of CM by imaging criteria are asymptomatic.…”

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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“…Based on studies, the incidence of ACM type I remains unclear [3]. However, retrospective investigation of magnetic resonance imaging (MRI) of the head revealed that the prevalence may be as high as 1 in 1280 [4].…”

Section: Introductionmentioning

confidence: 99%

A Successful Pregnancy Outcome after Surgical Decompression of Type I Arnold-Chiari Malformation

Ip¹,

Pankaja²,

O’Mahony³

2015

OJOG

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Type I Arnold-Chiari malformation (ACM) usually presents in adulthood and consists of a downward displacement of the cerebellar tonsils through the foramen magnum. A 25-year-old woman presented with a 5-month history of headache associated with blurred vision, tinnitus and sickness. Imaging recognised the need for surgical intervention, but whilst awaiting for surgery she fell pregnant. Considering the risks of neurological deterioration, the woman underwent surgical decompression of type I ACM at 15 weeks gestation. She subsequently presented with progressively worsening headaches during late pregnancy from 35 weeks. The obstetric plan was initially induction of labour at term but since the onset of worsening symptoms, this date was brought forward to 39 + 1 weeks gestation. She proceeded to have a normal delivery with no neonatal complications and an uneventful puerperium followed. Since the delivery, the patient reported fewer symptoms, showed no signs of neurological deficit and a repeat magnetic resonance imaging of the head showed good relief of neural compression. This case illustrates how judicious selection of the appropriate mode of delivery of women following surgically corrected ACM and a multidisciplinary approach is critical in the successful management of the antepartum period and labour.

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Asymptomatic Chiari Type I malformations identified on magnetic resonance imaging

Abstract: The authors suggest 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. Strategies for treating patients with asymptomatic CMIs are discussed.

Cited by 476 publications

References 51 publications

Clinical evidence for cervical myelopathy due to Chiari malformation and spinal stenosis in a non-randomized group of patients with the diagnosis of fibromyalgia

Clinical evidence for cervical myelopathy due to Chiari malformation and spinal stenosis in a non-randomized group of patients with the diagnosis of fibromyalgia

Incidental Findings on Brain and Spine Imaging in Children

A Successful Pregnancy Outcome after Surgical Decompression of Type I Arnold-Chiari Malformation

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