Bibliographic record
Abstract
The article by Paterson and Holdsworth in this issue (pages 675–676) highlights several important features. First, focal neurological events are rarely cause by aneurysmal disease of the extracranial arteries. Investigations that exclude cardiac sources for emboli are usually followed by investigations of the carotid bifurcation for stenotic disease. It is surprising that duplex did not detect the aneurysm at the bifurcation in the second case reported, but ultrasound is notoriously dependent upon the skill of the operator. Duplex correctly diagnosed an aneurysm of the carotid bifurcation in the third case. Arteriography is known to be unreliable in the diagnosis of arterial aneurysms, as they often contain thrombus. Ultrasound is the first line investigation, followed by either computed tomography or magnetic resonance imaging (MRI). In the first case, however, angiography identified an aneurysm of the innominate artery but neither duplex nor angiography identified aneurysmal disease in the second case. Angiography of the carotid arteries carries a risk of neurological damage, and should by undertaken only after non-invasive investigations such as duplex and/or MRI. However, angiography may be very useful in the diagnosis, as exemplified in cases 1 and 2. Aneurysms of the carotid bifurcation are very rare, accounting for 0.5% of carotid operations performed at one institution in a recent report.1 Most of the aneurysms in this series were false aneurysms following previous carotid surgery. If surgery is excluded, however, most carotid aneurysms are caused by atherosclerosis and are associated with hypertension. Rare causes include fibromuscular dysplasia, radiation, infection, Marian's syndrome, cystic medionecrosis and granulomatous disease. False aneurysms may also be caused by both blunt and penetrating trauma. Patients may present with a pulsating mass in the neck, often noticed by a friend or relative, but the commonest reason is a focal cerebral event. It is rare these days for aneurysms to grow to a size where they might present with compressive symptoms, but cranial nerves and the sympathetic chain are at risk. Dysphagia has also been reported. Ligation of the carotid artery used to be the treatment of choice, but it was associated with a substantial rate of neurological complications.2-4 A meta-analysis showed that the results of carotid ligation carry a high risk of stroke (25%) and death (20%).5 Two recent series show good results from reconstruction. In the first, 67 cases were treated, two by ligation and 65 by reconstruction.1 The stroke and death rate was 9%. In the second, 25 cases were all reconstructed with no deaths and no major strokes,2 although they reported two minor cerebral events and 11 cranial nerve palsies. These results are worse than those reported for carotid endarterectomy.6 However, the surgery is often more difficult and the higher reaches of the carotid artery may be involved.
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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 | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 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 | 0.000 |
| 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 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".