Renal vein thrombosis in adults is normally triggered by infection (glomerulonephritis, renal sepsis), amyloidosis, SLE, diabetes, urinary obstruction, tumour thrombus.
The passive congestion causes the kidney to swell and become engorged and nephrons degenerate causing flank pain, haematuria and decreased urine output.
Treat by treating cause, and anticoagulation therapy.
References
https://radiopaedia.org/articles/renal-vein-thrombosis
https://pubmed.ncbi.nlm.nih.gov/30725656/
