Penile metastasis from primary transitional cell carcinoma of the bladder sparing the urethra
Bibliographic record
Abstract
Metastatic involvement of the penis is relatively infrequent. Metastasis of transitional cell carcinoma (TCC) is extremely rare. We report a case of bladder TCC with metastases to the penis that spares the urethra - a finding that, to the best of our knowledge, has not been previously reported. Of the documented mechanisms of metastatic transmission to the penis, we suspect the cause was retrograde lymphatic spread. In our case, a 59-year-old male presented to our clinic initially with phimosis and later developed gross hematuria. Subsequent cystoscopy noted the appearance of tumour extending into the prostate, as well as the appearance of extensive TCC throughout the bladder. Following transurethral resection of prostate and bladder tissue, which demonstrated high-grade urothelial carcinoma, the patient underwent a radical cystoprostatectomy. A year later, he developed worsening gross hematuria and we noted the appearance of primary penile squamous cell malignancy. He then underwent a partial penectomy. The histopathology evaluation result from the partial penectomy revealed infiltration of TCC in the glans penis, as well as invasion into the corpus spongiosum, with sparing of the urethra.
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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 | 0.000 |
| 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 | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.003 | 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".