Peritoneal Dialysis Exit Site Pyoderma Gangrenosum: A Case Report
Bibliographic record
Abstract
BACKGROUND: Pyoderma gangrenosum (PG) is a rare, chronic inflammatory condition exhibiting mucopurulent or hemorrhagic exudates. The majority of cases are associated with inflammatory bowel disease, rheumatological diseases, and hematological malignancies. In the absence of typical serological markers and specific histopathological changes, the diagnosis is often clinical. Being rare, it is frequently misdiagnosed, which leads to a delay in instituting appropriate therapy. CASE PRESENTATION: We present a 53-year-old male of Aboriginal descent with end-stage renal disease due to diabetes who underwent insertion of a peritoneal dialysis (PD) catheter. Five weeks after PD catheter insertion, he started to notice a painful ulcer surrounded by a bed of erythema. The lesion eventually progressed to a purulent, hemorrhagic ulcer surrounded by a raised, irregular, violaceous border along the entirety of the PD catheter tunnel. There was no history of underlying systemic diseases commonly associated with PG. The catheter was removed, and an elliptical biopsy was taken, which ruled out infection, malignancy, and vasculitis. The changes were felt to be consistent with PG. The patient underwent treatment initially with topical corticosteroids, followed by oral prednisone, which unfortunately worsened his diabetic control; due to this, he was transitioned to cyclosporine, with complete resolution. CONCLUSIONS: Lesions at the PD catheter exit site are usually treated for infections. However, for ulcers that are painful, rapidly expanding, nonhealing, and unresponsive to antibiotics, PG should be considered as a differential diagnosis. This is the first reported case of PG occurring at the exit site of a PD catheter.
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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 | 0.003 |
| Meta-epidemiology (narrow) | 0.003 | 0.002 |
| Meta-epidemiology (broad) | 0.002 | 0.002 |
| Bibliometrics | 0.003 | 0.003 |
| Science and technology studies | 0.004 | 0.002 |
| Scholarly communication | 0.003 | 0.003 |
| Open science | 0.001 | 0.003 |
| Research integrity | 0.006 | 0.004 |
| 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".