Can posterior fossa decompression alone effectively treat Chiari malformation type I patients with even severe syringes? Illustrative cases
Why this work is in the frame
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Bibliographic record
Abstract
BACKGROUND: The benefit of posterior fossa decompression (PFD) alone (without duraplasty) for Chiari malformation type I (CM-I) remains controversial. Many neurosurgeons still open the dura when a syrinx is present, particularly for what appears to be a severe syrinx. Based on the existing literature, the authors hypothesized that even a severe syrinx would respond well to a PFD alone. OBSERVATIONS: In a proof-of-principle study, the authors prospectively included 4 patients with CM-I, aged 3-15 years, with severe symptomatic syringes (spanning multiple cervical/thoracic levels and/or focally expanding the spinal cord) to undergo PFD with pre- and postdissection intraoperative MRI (iMRI). In all cases, same-day postdissection iMRI cine images showed enhanced CSF flow compared with predissection iMRI findings. Three of the 4 patients showed early syrinx and symptom improvement (≤ 6 weeks); all showed improvements at long-term follow-up (≥ 2 years). The mean hospital length of stay (LOS) was 1.25 days, with no complications or repeat surgery needed, and the mean follow-up was 37.5 months. LESSONS: CM-I can be treated via PFD alone without duraplasty, even with a severe syrinx. Improved CSF flow is achieved intraoperatively, and the syrinx can significantly decrease over a 6-week to 1-year period postoperatively. Additional benefits include a low risk of complications and a short LOS. https://thejns.org/doi/10.3171/CASE24777.
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Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it