A Large Left Atrial Myxoma
Bibliographic record
Abstract
A myxoma is reportedly the most common benign cardiac tumor. 1 The common site of origin is the left atrium (LA), specifically interatrial septum (IAS) at the fossa ovalis. 2 Most myxomas are sessile and the weight of resected neoplasms ranges from 5 to 125 g (mean: 40 g). 3 Malignant transformation has been controversial, however, the current consensus is that this is a benign neoplasm with no malignant potential.It is likely that reports of malignant myxomas are cases of sarcomas with myxoid features that have been misdiagnosed as a myxoma.4 CLINICAL SUMMARYA 66-year-old asymptomatic male, who had previously presented with palpitation and a late systolic murmur due to mitral valve prolapse was referred for the evaluation of a left atrial (LA) mass detected on transthoracic echocardiography (TTE).Transesophageal echocardiogram showed a nonhomogenous mass measuring 3.5 × 2.5 cm attached to the IAS at the fossa ovalis and the dome of the LA, consistent with LA myxoma (Fig. 1A and B).This was associated with prolapse of the posterior mitral leaflet (P2), ruptured chordae tendinea, and eccentric anteriorly directed jet of mitral regurgitation.Coronary angiography showed normal coronary arteries and significant vascularity of the LA mass with a large vessel arising from the circumflex coronary artery.Due to the reported marked vascularity, the mass, IAS, and dome of the LA were all excised en bloc and the IAS reconstructed with a pericardial patch.The postoperative course was unremarkable and TTE showed no evidence of shunting.
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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 | 0.008 |
| Meta-epidemiology (narrow) | 0.002 | 0.001 |
| Meta-epidemiology (broad) | 0.002 | 0.002 |
| Bibliometrics | 0.005 | 0.001 |
| Science and technology studies | 0.003 | 0.002 |
| Scholarly communication | 0.002 | 0.005 |
| Open science | 0.002 | 0.002 |
| Research integrity | 0.009 | 0.006 |
| Insufficient payload (model declined to judge) | 0.006 | 0.002 |
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".