Possi, your kidneys sound a lot like what was happening in my liver. Docs here have decided it is nothing, but I never got checked out for amyloidosis which kind of worries me as I have in the past had a skin biopsy showing amyloid. In my liver, first off an ultrasound scan showed a slightly denser patch that they decided was a haemangioma. A few years later another upper abdominal ultrasound showed something in the same kind of place, maximum about 2.5 cm long, that they decided was a fatty nodule. I then had another ultrasound 3 months later that showed it fairly much the same, and had a third ultrasound ordered for a further 6 months on just to confirm it hadn't changed. Well, by the time they came to do that last one it was really hard to identify the "nodule" because whatever the changes were it had spread in a patchy way right through my liver, so the nodule didn't really show up. At that point they decided it was just fatty liver disease and discharged me. However, my liver function tests are NOT consistent with fatty liver disease (being quite normal), so I am really wondering if the echogenicity or denseness in my liver was really something else - and given the previous amyloid on my skin I thought that they should at least have considered that. But this is the NHS, so no. I am going to ask the rheumatologist about it though, because he is the only one so far who has even vaguely considered the possibility of secondary amyloid. I also have borderline chronic kidney disease which is unexplained.