Isolated Leptomeningeal Carcinomatosis in Urothelial Carcinoma: A Case Report of Positive CSF Cytology With Negative Imaging
Bibliographic record
Abstract
Bladder cancer is one of the most common cancers worldwide; however, leptomeningeal carcinomatosis (LMC) is an uncommon and understudied complication. We report a male patient diagnosed with LMC while in apparent clinical remission of metastatic urothelial carcinoma of the bladder. He presented with headaches, vision changes, hearing impairment, and leg weakness. Imaging of the brain and spinal cord was negative; however, the cerebrospinal fluid was positive for malignant cells consistent with high-grade urothelial carcinoma, confirming the diagnosis of LMC. Conservative measures and whole-brain radiation were ineffective, and he died 2 months after his LMC diagnosis. Literature review identified 45 cases of LMC due to bladder cancer, and we summarize these data. It is unclear whether new and more effective systemic treatment approaches for urothelial carcinoma will also reduce the risk of LMC or provide better treatment for LMC, supporting a need for more study of this devastating complication.
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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 | 0.004 |
| Meta-epidemiology (narrow) | 0.003 | 0.002 |
| Meta-epidemiology (broad) | 0.002 | 0.001 |
| Bibliometrics | 0.005 | 0.003 |
| Science and technology studies | 0.004 | 0.003 |
| Scholarly communication | 0.003 | 0.003 |
| Open science | 0.002 | 0.003 |
| Research integrity | 0.006 | 0.003 |
| 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".