A Forty-Three-Year-Old Male With Penile and Cavernous Metastases From Rectal Cancer
Bibliographic record
Abstract
Metastasis to the cavernous bodies from colorectal cancer (CRC) is an exceptionally rare condition, typically associated with systemic dissemination and an ominous prognosis. It often presents synchronously with liver and lymph node involvement. A 43-year-old male presented with perineal pain, rectal bleeding, and urinary obstructive symptoms. Imaging studies revealed a KRAS-mutated rectal adenocarcinoma, classified as stage IV, with synchronous metastases to the cavernous bodies and liver. Treatment was initiated with FOLFOXIRI (folinic acid, 5-fluorouracil, oxaliplatin and irinotecan) chemotherapy but was discontinued due to tumor lysis syndrome and toxicity linked to a UGT1A1 mutation. Despite modified FOLFOX (folinic acid, fluorouracil, oxaliplatin) plus bevacizumab, the disease progressed rapidly, prompting transition to palliative care and subsequent death. Cavernous body involvement in CRC reflects advanced disease, frequently accompanied by synchronous metastases and a limited life expectancy. This case underscores the poor prognostic significance of such metastases, suggests pelvic lymphatic spread as a likely mechanism, and highlights the critical impact of pharmacogenetics on treatment tolerance and outcomes. A review of the literature emphasizes the aggressive biology of such presentations. Penile metastases from CRC are rare but devastating, indicating disseminated disease. Multidisciplinary management should prioritize symptom control, with targeted therapies reserved for select cases. This case illustrates the need for heightened clinical suspicion in patients with a history of malignancy presenting with urological symptoms.
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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 | 0.002 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.002 | 0.001 |
| Science and technology studies | 0.002 | 0.001 |
| Scholarly communication | 0.001 | 0.002 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.003 | 0.003 |
| 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".