Acute neurologic presentation of a 2‐year‐old standardbred colt with multicentric diffuse large B cell lymphoma
Bibliographic record
Abstract
Summary Lymphoma in horses is uncommon and rarely diagnosed as a cause of ataxia. This case report describes a 2‐year‐old Standardbred cryptorchid colt who presented with acute onset of grade 3–4/5 spinal ataxia in all four limbs, with the hindlimbs more severely affected than forelimbs and severe proprioceptive deficits. Due to the severity of the ataxia, a full neurologic examination could not be completed, and the colt was humanely euthanised. Post‐mortem examination revealed multiple osteochondritis dissecans lesions in the cervical and lumbar spine. Initially, this was thought to be the cause of the ataxia; however, histopathology revealed multifocal areas where the spinal nerve roots and epidural surface of the dura mater of the meninges were surrounded or covered by plaques of neoplastic round cells which infiltrated the adipose tissue surrounding the spinal tissues. Atypical round cells similar to those observed in the spinal meningeal tissues were also found in the kidneys, lungs, liver, testes and one lymph node. Immunohistochemical staining of meningeal tissue samples revealed moderate‐to‐intense cytoplasmic/membranous immunoreactivity for CD20 and a diagnosis of multicentric diffuse large B cell lymphoma was made. These results indicate that lymphoma should be included as a differential diagnosis for a horse presenting with acute ataxia that does not have evidence of spinal cord compression, equine protozoal myeloencephalitis, equine herpesvirus‐1 myeloencephalopathy, equine degenerative myeloencephalopathy, equine motor neuron disease, trauma or other more common sources of ataxia.
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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) | 0.002 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.003 | 0.001 |
| 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".