Indolent Abdominal Wall Round Cell Sarcoma With EWSR1-PATZ1 Fusion: A Case Report and Literature Review
Bibliographic record
Abstract
Soft tissue sarcomas with Ewing Sarcoma Breakpoint Region 1-POZ/BTB and AT Hook Containing Zinc Finger 1 (EWSR1-PATZ1) gene fusion represent a recently recognized subgroup of "round cell sarcomas with EWSR1-non-ETS fusions." These tumors exhibit diverse morphologic features and a polyphenotypic immunoprofile, often co-expressing neural and skeletal muscle markers. Their clinical behavior ranges widely, from indolent to highly aggressive. We report the case of a 57-year-old man presenting with a 6.5 cm right abdominal wall mass incidentally discovered on CT imaging performed for choledocholithiasis. Ultrasound-guided biopsy revealed a low-grade spindle cell neoplasm, and the patient subsequently underwent marginal excision. Microscopic examination showed solid and pseudocystic architecture with thick fibrous septa, composed of round and spindle cells with eosinophilic or clear vacuolated cytoplasm and vesicular chromatin. Immunohistochemistry displayed positivity for CD99, BCL-2, and patchy desmin positivity. Targeted gene fusion analysis confirmed EWSR1-PATZ1 fusion. Given the long-standing, asymptomatic nature of the mass, the patient was managed with clinical surveillance and remains disease-free for three years post-excision. Due to the rarity of these tumors, their biologic behavior and optimal management remain uncertain, highlighting the need for individualized treatment strategies and long-term follow-up.
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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 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.007 | 0.005 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.002 | 0.002 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.002 | 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".