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    My 2 Year old daughter has on kidney smaller then the other one.
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    JoanieE25 posted:
    My daughter had a Urinary Track Infection couple weeks ago and finsh her antibiotics, took her in for a ultrasound her doctor wanted done to make sure her kidneys are fine and find out today one kidney is smaller then the other? Why is this the case and what can cause this, what will they more likely do?? Her doctor is ordering more test to be done. I am worried and not educated much about the Kidneys.
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    john-skpt responded:
    It sort of depends on which was smaller, right or left, and exactly how much smaller it seems.

    The right is always a bit smaller since the liver is on the right side and there just isn't as much space on the right. Obviously we can assume that the doc has seen dozens of renal ultrasounds so we have to assume that he means "smaller than expected".

    Generally kidneys show reduced size because of some very slow damage; this might be from repeated infections over the long term, it might be from a slightly reduced blood supply over the long term, and a lot of other reasons.

    I'd guess that the doc will look at the blood flow (with a doppler ultrasound, or maybe with angiography), look at evidence of recurrent infections, inflammation, and maybe look for autoimmune conditions (but probably not yet for this last item since the testing can be fairly tedious to interpret.)

    It may not be serious at all, just something to watch over the decades ahead. But I think that the doc is wise to at least try to find out more about what might be going on, and set up a baseline to compare against future tests.


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