A Retrospective Case Study of Two Consecutive Liver Biopsies in a Patient With Obliterative Portal Venopathy
Bibliographic record
Abstract
Obliterative portal venopathy (OPV) is a rare hepatic vascular disorder that has only recently become well recognized, in part from explanted liver of transplant patients. OPV often presents as a sudden onset of portal hypertension with no significant liver enzyme derangement. Histopathology remains the only means of diagnosis. We report a case of OPV in a 60 year-old man with ulcerative colitis (UC) treated with azathioprine (AZA). The patient was diagnosed with UC 25 years ago and started on AZA. There was no known history of liver disease. One year prior to a series of 2 biopsies, he was found to have slightly elevated bilirubin. The first liver biopsy was reported as “no significant pathological findings.” 9 months later, he presented with abdominal discomfort, and was found to have ascites and other clinical features of portal hypertension. Liver enzymes were within normal limits, and total bilirubin was still slightly elevated, 26 μmol/L (3-18 normal range). Immunoglobulins and liver serology were noncontributory. A second liver biopsy was performed at this time, demonstrating near normal liver architecture and no evidence of cirrhosis. The portal tracts were expanded with fibrosis and had a paucity of portal veins. Sinusoids showed random dilatation (megasinusoids), and few remaining portal veins appeared arterialized. The pathologic index of OPV was high, and with further ancillary testing and clinical correlation, a diagnosis of OPV was made. AZA was discontinued and the patient’s condition was clinically stable. OPV is a rare entity and can be a complication of long-term AZA treatment. This disorder must be considered in liver biopsies with near-normal architecture, and communication between clinician and pathologist is the key to the diagnosis.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
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 teacher head, 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".