Calcified embolus mimics patent middle cerebral artery on CT angiogram
Bibliographic record
Abstract
A 61-year-old woman presented with acute symptoms of right middle cerebral artery ischaemia, with left face/arm/leg weakness, right gaze preference and homonymous hemianopia. A non-contrast CT scan of the head showed a calcified Y-shaped hyperdensity at the right middle cerebral artery bifurcation (figure 1A). We did not identify any contraindications for thrombolytic therapy, and the patient was treated with intravenous tissue plasminogen activator. Figure 1 Hyperdense calcific thrombus at the right middle cerebral artery bifurcation. We used a multi-phase CT angiogram to assess her cerebrovascular status. We expected a role for endovascular intervention given the clinical deficits and corresponding right middle cerebral artery bifurcation hyperdensity, which we assumed to be thrombus. However, the initial phase of the CT angiogram did not show the expected occlusion …
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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 | 0.001 | 0.005 |
| Meta-epidemiology (narrow) | 0.002 | 0.001 |
| Meta-epidemiology (broad) | 0.002 | 0.001 |
| Bibliometrics | 0.003 | 0.001 |
| Science and technology studies | 0.001 | 0.002 |
| Scholarly communication | 0.002 | 0.003 |
| Open science | 0.002 | 0.001 |
| Research integrity | 0.010 | 0.008 |
| Insufficient payload (model declined to judge) | 0.003 | 0.004 |
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".