Volumetric Morphometric Analysis of Posterior Fossa Structures Following Posterior Fossa Decompression with Superficial Durotomy in Chiari I Malformation
- 1Department of Neurosurgery, Afyonkarahisar Health Sciences University, 03030 Afyonkarahisar, Turkey
- 2Department of Radiology, Afyonkarahisar Health Sciences University, 03030 Afyonkarahisar, Turkey
Abstract
Background/Objectives: Posterior fossa decompression (PFD) with superficial durotomy is used in Chiari I malformation to limit the CSF-related complications of complete durotomy and duraplasty, but quantitative volumetric evidence has relied on linear measurements, modest cohorts, and heterogeneous methods. We applied a fully automated deep-learning segmentation pipeline to characterize multi-structure volumetric change after PFD with superficial durotomy. Methods: Thirty-three patients (24 females and nine males; mean age, 39.2 ± 13.5 years; two pediatric) with symptomatic Chiari I malformation underwent PFD with superficial durotomy. Pre-operative and 6-month post-operative 3D T1-weighted 1.5T MRIs were segmented using nnU-Net, CERES, TotalSegmentator, and nnDetection. Posterior fossa volume (PFV), supratentorial volume, PFV/STV ratio, cerebellar volume, brainstem volume, fourth ventricle volume, basal cisterns’ CSF volume, and tonsillar descent were computed and compared pre/post using paired t-tests or Wilcoxon tests, Cohen’s d with bootstrapped 95% confidence intervals, and Benjamini–Hochberg correction. The pipeline was developed and validated exclusively on 1.5T Siemens Aera data and is not presented as ready for out-of-box use on other scanner platforms without re-validation. Results: PFV increased from 166.0 ± 12.9 to 172.5 ± 13.1 mL (Δ + 6.5 mL; p < 0.001; d = 1.72). Tonsillar descent decreased from 8.0 ± 2.8 to 4.9 ± 2.8 mm (Δ −3.1 mm; p < 0.001; d = −2.74). Basal cisterns’ CSF volume increased from 8.8 ± 1.5 to 11.0 ± 2.4 mL (Δ + 2.2 mL; p < 0.001; d = 1.16). Fourth ventricle volume increased (p < 0.001; d = 1.58). Cerebellar volume increased modestly (p < 0.001, q < 0.001; d = 0.86), while brainstem volume was unchanged (p = 0.22, q = 0.22; d = −0.11). Seven of eight primary outcomes remained significant after false-discovery-rate correction. Twenty-nine of 33 patients (87.9%) achieved tonsillar ascent of at least 2 mm. Conclusions: Automated volumetric analysis demonstrated significant posterior fossa expansion, basal cisterns’ CSF augmentation, fourth ventricle enlargement, and tonsillar ascent after PFD with superficial durotomy. These effect sizes provide a quantitative benchmark for sample-size estimation in future comparative surgical trials and for patient counseling on expected structural change at 6 months.
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BibTeX
@article{canbek2026volumetric,
title = {{Volumetric Morphometric Analysis of Posterior Fossa Structures Following Posterior Fossa Decompression with Superficial Durotomy in Chiari I Malformation}},
author = {İhsan Canbek and Muhammed Enes Demir and Emin Demirel and Mehmet Gazi Boyacı and Serhat Yıldızhan and Serhat Korkmaz and Usame Rakip and Adem Aslan},
journal = {Journal of Clinical Medicine},
year = {2026},
month = oct,
doi = {10.3390/jcm15208053},
url = {https://www.mdpi.com/2077-0383/15/20/8053},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - Volumetric Morphometric Analysis of Posterior Fossa Structures Following Posterior Fossa Decompression with Superficial Durotomy in Chiari I Malformation
AU - İhsan Canbek
AU - Muhammed Enes Demir
AU - Emin Demirel
AU - Mehmet Gazi Boyacı
AU - Serhat Yıldızhan
AU - Serhat Korkmaz
AU - Usame Rakip
AU - Adem Aslan
PY - 2026
DA - 2026/10/01
JO - Journal of Clinical Medicine
DO - 10.3390/jcm15208053
UR - https://www.mdpi.com/2077-0383/15/20/8053
AB - Background/Objectives: Posterior fossa decompression (PFD) with superficial durotomy is used in Chiari I malformation to limit the CSF-related complications of complete durotomy and duraplasty, but quantitative volumetric evidence has relied on linear measurements, modest cohorts, and heterogeneous methods. We applied a fully automated deep-learning segmentation pipeline to characterize multi-structure volumetric change after PFD with superficial durotomy. Methods: Thirty-three patients (24 females and nine males; mean age, 39.2 ± 13.5 years; two pediatric) with symptomatic Chiari I malformation underwent PFD with superficial durotomy. Pre-operative and 6-month post-operative 3D T1-weighted 1.5T MRIs were segmented using nnU-Net, CERES, TotalSegmentator, and nnDetection. Posterior fossa volume (PFV), supratentorial volume, PFV/STV ratio, cerebellar volume, brainstem volume, fourth ventricle volume, basal cisterns’ CSF volume, and tonsillar descent were computed and compared pre/post using paired t-tests or Wilcoxon tests, Cohen’s d with bootstrapped 95% confidence intervals, and Benjamini–Hochberg correction. The pipeline was developed and validated exclusively on 1.5T Siemens Aera data and is not presented as ready for out-of-box use on other scanner platforms without re-validation. Results: PFV increased from 166.0 ± 12.9 to 172.5 ± 13.1 mL (Δ + 6.5 mL; p < 0.001; d = 1.72). Tonsillar descent decreased from 8.0 ± 2.8 to 4.9 ± 2.8 mm (Δ −3.1 mm; p < 0.001; d = −2.74). Basal cisterns’ CSF volume increased from 8.8 ± 1.5 to 11.0 ± 2.4 mL (Δ + 2.2 mL; p < 0.001; d = 1.16). Fourth ventricle volume increased (p < 0.001; d = 1.58). Cerebellar volume increased modestly (p < 0.001, q < 0.001; d = 0.86), while brainstem volume was unchanged (p = 0.22, q = 0.22; d = −0.11). Seven of eight primary outcomes remained significant after false-discovery-rate correction. Twenty-nine of 33 patients (87.9%) achieved tonsillar ascent of at least 2 mm. Conclusions: Automated volumetric analysis demonstrated significant posterior fossa expansion, basal cisterns’ CSF augmentation, fourth ventricle enlargement, and tonsillar ascent after PFD with superficial durotomy. These effect sizes provide a quantitative benchmark for sample-size estimation in future comparative surgical trials and for patient counseling on expected structural change at 6 months.
SN - 2077-0383
ER -