Posterior fossa volume increase after surgery for Chiari malformation Type I: a quantitative assessment using magnetic resonance imaging and correlations with the treatment response

Noudel, R.; Gomis, Philippe; Soto-Ares, Gustavo; Bazin, Arnaud; Piérot, Laurent; Pruvo, Jean‐Pierre; Bordet, Régis; Roche, Pièrre-Hugues

doi:10.3171/2010.11.jns102148

Cited by 44 publications

(35 citation statements)

References 58 publications

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“…[1][2][3][4][5][6][7][8][9][11][12][13][14][15][16][17][18][19][65][66][67]70,71,100,[102][103][104][105][106][107][108][109][110][111][113][114][115][116][117][118][119][120][121][122][123][124][125][126][127][128][129][130][132]…”

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Pediatric and adult Chiari malformation Type I surgical series 1965–2013: a review of demographics, operative treatment, and outcomes

Arnautovic

Splavski

Boop

et al. 2015

PED

185

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OBJECT Chiari malformation Type I (CM-I) is a hindbrain disorder associated with elongation of the cerebellar tonsils, which descend below the foramen magnum into the spinal canal. It occurs in children and adults. Clinical symptoms mainly develop from alterations in CSF flow at the foramen magnum and the common subsequent development of syringomyelia. METHODS The authors reviewed English-language reports of pediatric, adult, and combined (adult and pediatric) surgical series of patients with CM-I published from 1965 through August 31, 2013, to investigate the following: 1) geographical distribution of reports; 2) demographics of patients; 3) follow-up lengths; 4) study durations; 5) spectrum and frequency of surgical techniques; 6) outcomes for neurological status, syrinx, and headache; 7) frequency and scope of complications; 8) mortality rates; and 9) differences between pediatric and adult populations. Research and inclusion criteria were defined, and all series that contained at least 4 cases and all publications with sufficient data for analysis were included. RESULTS The authors identified 145 operative series of patients with CM-I, primarily from the United States and Europe, and divided patient ages into 1 of 3 categories: adult (> 18 years of age; 27% of the cases), pediatric (≤ 18 years of age; 30%), or unknown (43%). Most series (76%) were published in the previous 21 years. The median number of patients in the series was 31. The mean duration of the studies was 10 years, and the mean follow-up time was 43 months. The peak ages of presentation in the pediatric studies were 8 years, followed by 9 years, and in the adult series, 41 years, followed by 46 years. The incidence of syringomyelia was 65%. Most of the studies (99%) reported the use of posterior fossa/foramen magnum decompression. In 92%, the dura was opened, and in 65% of these cases, the arachnoid was opened and dissected; tonsillar resection was performed in 27% of these patients. Postoperatively, syringomyelia improved or resolved in 78% of the patients. Most series (80%) reported postoperative neurological outcomes as follows: 75% improved, 17% showed no change, and 9% experienced worsening. Postoperative headaches improved or resolved in 81% of the patients, with a statistical difference in favor of the pediatric series. Postoperative complications were reported for 41% of the series, most commonly with CSF leak, pseudomeningocele, aseptic meningitis, wound infection, meningitis, and neurological deficit, with a mean complication rate of 4.5%. Complications were reported for 37% of pediatric, 20% of adult, and 43% of combined series. Mortality was reported for 11% of the series. No difference in mortality rates was seen between the pediatric and adult series. CONCLUSIONS Before undergoing surgical treatment for CM-I, symptomatic patients and their families should be given clear information about the success of treatment and potential complications. Furthermore, surgeons may benefit from comparing published data with their own. In the future, operative CM-I reports should provide all details of each case for the purpose of comparison.

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Section: General Informationunclassified

“…Combined series, which included both pediatric and adult patients, constituted 61 reports (42%). [5][6][7]9,11,12,[25][26][27]34,37,38,40,43,44,46,47,52,53,55,63,66,67,70,73,74,76,83,87,90,91,94,96,100,102,103,106,110,111,114,115,117,121,126,127,129,130,132,135,[138][139][140]…”

Section: General Informationmentioning

confidence: 99%

Pediatric and adult Chiari malformation Type I surgical series 1965–2013: a review of demographics, operative treatment, and outcomes

Arnautovic

Splavski

Boop

et al. 2015

PED

185

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“…1,10 In their series of 11 patients undergoing intradural decompression without duraplasty, Noudel et al measured the increase in posterior fossa volume (PFV) and correlated it with clinical outcomes. 19 They found that the degree of PFV increase positively correlated with symptomatic improvement (p = 0.014). There was a greater in- crease in PFV in patients with a smaller starting volume, and an increase of at least 15% was needed for a complete recovery.…”

Section: Extradural Chiari Decompression Is a Viable And Reproduciblymentioning

confidence: 99%

“…Functional grade was determined using a grading scale previously reported by Noudel et al 19 Patients received an initial postoperative follow-up visit in the clinic between 5 and 40 days (mean 16.27 days), with continual follow-up at several-month intervals thereafter. Clinical improvement was determined by an author who only assessed clinical symptoms and was blinded to the radiological results.…”

Section: Neurological Assessmentmentioning

confidence: 99%

“…Posterior fossa and cisterna magna area were measured using T2-weighted imaging at the midsagittal plane. The method for determining posterior fossa area was based on previously reported methods of measuring posterior fossa 19 and cisterna magna 23 volumes. Narrowing of CSF spaces anterior and posterior to the spinal cord was assessed on T2-weighted MRI.…”

Section: Radiological Studiesmentioning

confidence: 99%

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Multimodal evaluation of CSF dynamics following extradural decompression for Chiari malformation Type I

Quon¹,

Grant²,

DiLuna³

2015

SPI

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OBJECT Extradural decompression is a minimally invasive technique for treating Chiari malformation Type I (CM-I) that avoids the complications of dural opening. While there is no agreement on which surgical method is optimal, mounting evidence demonstrates that extradural decompression effectively treats clinical symptoms, with a minimal reoperation rate. Neurological symptoms such as headache may be related to obstructed flow of CSF, and one aspect of successful extradural decompression is improved CSF dynamics. In this series, the authors report on their use of phase-contrast cine flow MRI to assess CSF flow as well as satisfactory decompression. METHODS The authors describe their first surgical series of 18 patients with CM-I undergoing extradural decompression and correlate clinical improvement with radiological changes. Patients were categorized as having complete, partial, or no resolution of their symptoms. Posterior fossa area, cisterna magna area, and tonsillar herniation were assessed on T2-weighted MRI, whereas improvement of CSF flow was evaluated with phase-contrast cine flow MRI. All patients received standard pre- and postoperative MRI studies; 8 (44.4%) patients had pre- and postoperative phase-contrast cine, while the rest underwent cine studies only postoperatively. RESULTS All 18 patients presented with symptomatic CM-I, with imaging studies demonstrating tonsillar herniation ≥ 5 mm, and 2 patients had associated syringomelia. All patients underwent suboccipital decompression and C-1 laminectomy with splitting of the dura. Patients with complete resolution of their symptoms had a greater relative increase in cisterna magna area compared with those with only partial improvement (p = 0.022). In addition, in those with complete improvement the preoperative cisterna magna area was smaller than in those who had either partial (0.020) or no (0.025) improvement. Ten (91%) of the 11 patients with improved flow also had improvement in their symptoms. There was 1 postoperative complication of dysphagia and dysphonia. None of the patients have required a second operation. CONCLUSIONS Extradural decompression has the potential to be the first-line treatment for CM-I but has been lacking an objective measure by which to assess surgical success as well as the need for reoperation. An increase in the CSF spaces and improved CSF dynamics may be associated with resolution of clinical symptoms. Including cine imaging as part of routine pre- and postoperative evaluation can help identify which patients are most likely to benefit from surgery.

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Measurement of the Volume of the Posterior Cranial Fossa Using MRI

Acer

Turğut

Yılmaz

et al. 2020

The Chiari Malformations

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Posterior fossa volume increase after surgery for Chiari malformation Type I: a quantitative assessment using magnetic resonance imaging and correlations with the treatment response

Cited by 44 publications

References 58 publications

Pediatric and adult Chiari malformation Type I surgical series 1965–2013: a review of demographics, operative treatment, and outcomes

Pediatric and adult Chiari malformation Type I surgical series 1965–2013: a review of demographics, operative treatment, and outcomes

Multimodal evaluation of CSF dynamics following extradural decompression for Chiari malformation Type I

Measurement of the Volume of the Posterior Cranial Fossa Using MRI

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