An Extended Nasoseptal Flap for Anterior Skull Base Reconstruction: Cadaver Study
Bibliographic record
Abstract
Background The adequate reconstruction of a skull base defect is paramount for good patient outcomes. The goals of reconstruction for defects produced by the expanded endoscopic endonasal approach (EEA) are identical to those of reconstructing conventional external approach and include the complete separation of the cranial cavity from the sinonasal tract, the elimination of dead space, and preservation of neurovascular and ocular function. The use of nonvascularized free grafts for the repair of a cerebrospinal fluid (CSF) leak following endoscopic sinus surgery and trauma generally results in successful repair of small CSF leaks. However, endoscopic reconstruction with multilayered free grafts for larger dural defects following skull base tumors resection is associated with a postoperative leak rate of 20 to 30%. However, with the advent of pedicled vascularized flaps, in particular, the nasoseptal flap, CSF leak rates have decreased. Despite this success, specifically, the nasoseptal flap is limited in its ability to reach extremely anterior defects and to cover defects involving more than one anatomical segment, such as those involving the posterior frontal table, and the planum sphenoidale. We present the cadaver study results of an extension of the nasoseptal flap for reconstruction of very large midline defects following endoscopic expanded endonasal approach to allow for vascularized reconstruction of the skull base.
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How this classification was reachedexpand
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 | 0.002 | 0.002 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.003 | 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 itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, 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".