Mine was caused by dysplastic horseshoe kidney which is both rare and hereditary. Whenever I am having an utrasound for something else, everyone asks if they can take a look at my horseshoe as they haven't see one before. Nothing unusual there. It just looks like a horseshoe with two kidney beans at each end.
Mine was glomerulonephritis of unknown origin! By the time I was diagnosed I was already end stage and my Nephrologist said there wasn't any way of knowing for sure. My doctors and surgeons now days say it was probably a Staph infection.
Hey, you left out Henoch-Schoenlein Purpura, the type of renal failure that killed Mozart! It is not a statistically important cause of renal failure, but I had to mention it because I just love to say, "Henoch-Schoenlein." "Schoenlein" is also German for "pretty little thing," a term of endearment sometimes used among lovers there, but it does not describe the horrors of that disease very well!