Idiopathic Renal AA Amyloidosis with Bilateral Nephromegaly and Rapid Progression to ESRD: A Case Report and Literature Review
Bibliographic record
Abstract
Introduction: AA amyloidosis, a complication of chronic inflammation, is characterized by the extracellular deposition of the serum amyloid A (SAA) protein. This condition is often associated with infections, autoimmune diseases, and hereditary inflammatory disorders. However, cases without an identifiable trigger, referred to as idiopathic AA amyloidosis, are rare. Renal involvement is frequent, but bilateral nephromegaly and rapid progression to end-stage renal disease (ESRD) are unusual features. We present a case of idiopathic AA amyloidosis with these rare characteristics, highlighting the diagnostic challenges and discussing potential underlying mechanisms. Case Description: A 30-year-old Afghan woman with a remote history of childhood pulmonary tuberculosis presented two months postpartum with nausea, vomiting, and lower extremity edema. She was found to have nephrotic-range proteinuria, creatinine of 1169 µmol/L (previously 60 µmol/L four months prior), and bilateral nephromegaly. Renal biopsy confirmed AA amyloidosis via Congo red staining, immunohistochemistry, and mass spectrometry. Extensive workup for inflammatory, infectious, autoimmune, and malignant causes was negative, including tests for active tuberculosis and malignancy screening via PET-CT. Genetic testing of over 400 relevant genes was unremarkable. A diagnosis of idiopathic AA amyloidosis was made. She required immediate hemodialysis and subsequently transitioned to peritoneal dialysis. Discussion: This case highlights an aggressive form of idiopathic AA amyloidosis characterized by bilateral nephromegaly and rapid progression to end-stage renal disease, features more commonly associated with early-stage inflammatory diseases. Factors such as latent tuberculosis and obesity may have contributed through low-grade chronic inflammation, as suggested in some animal and human studies. SAA1 promoter screening could offer therapeutic insights, as a recently identified mutation may predict a favourable response to early IL-6 blockade therapy. Since no definitive treatment exists, management remains supportive, underscoring the need for further research to understand the condition and develop targeted therapies.
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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 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.009 | 0.007 |
| Science and technology studies | 0.001 | 0.002 |
| Scholarly communication | 0.002 | 0.003 |
| Open science | 0.002 | 0.001 |
| Research integrity | 0.002 | 0.002 |
| 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".