Anteroposterior Spondyloschisis of Atlas with Bilateral Cleft Defect of Posterior Arch
Bibliographic record
Abstract
In Brief Study Design. Case report and review of the literature. Objective. To report on a patient presenting with anteroposterior defects of the arch of the atlas with a rare type of posterior arch defect. This report includes a literature review of the hypothesis for the development of this anomaly. Summary of Background Data. Congenital bony defects of the atlas are uncommon. Isolated posterior clefts are the most frequent anomaly, but combined anterior and posterior defects are the least common. In particular, combined anteroposterior defects of the arch of the atlas with other types of posterior arch defects, not including type A, have not been reported. These anomalies can cause confusion, particularly in the setting of trauma when the radiologic finding may be misinterpreted as representing a fracture. Methods. We report here on a 22-year-old man with an anteroposterior defect of the atlas who complained of neck pain after a traffic accident. The computed tomography demonstrated well-corticated defects with sclerotic changes and no evidence of soft tissue swelling adjacent to the bony discontinuities, consistent with a congenital abnormality. Suspecting anteroposterior spondyloschisis, we performed only conservative treatment. Results. The patient improved on conservative therapy without a surgical procedure. Conclusion. We describe combined anteroposterior defects of the arch of the atlas along with other types of posterior arch defects. Most congenital defects of the arch of the atlas are found during radiologic evaluation of neck pain after trauma. Careful diagnosis is needed for these patients to avoid confusing these defects with a fracture. Combined anterior and posterior defects of atlas are uncommon. In particular, combined anteroposterior defects of the arch of the atlas with other types of posterior arch defects, not including type A, have not been reported. We describe anteroposterior spondyloschisis of atlas with bilateral cleft defect of posterior arch.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.002 | 0.001 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.002 | 0.001 |
| Insufficient payload (model declined to judge) | 0.006 | 0.001 |
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 itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".