Segmental Schwannomatosis of the Upper Extremity
Bibliographic record
Abstract
Schwannomatosis is characterized by the development of multiple schwannomas without evidence of vestibular tumors. Segmental schwannomatosis is defined as being limited to 1 limb or 5 or fewer contiguous segments of the spine. We report a case of a 38-year-old male with multiple, painful masses of the right upper extremity with associated numbness and paresthesia in the ulnar and radial nerve distribution. An open, microsurgical approach provided definitive diagnosis and treatment. Twenty-one cases of segmental schwannomatosis of the upper extremity have been reported in the literature, making this case the 22nd. It is 1 of 5 cases of segmental schwannomatosis to have simultaneous tumors in the forearm and hand. We are the first to report multiple schwannomas of the ulnar and ulnar sensory nerve and the second to report multiple schwannomas of the radial sensory nerve. We additionally review the literature regarding pathogenesis, diagnosis, and treatment of this uncommon tumor.
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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 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 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".