Hydronephrosis refers to when the kidneys are abnormally dilated or overfilled with urine. There are several causes, many of which do not cause any harm to the kidneys, but in some cases Hydronephrosis can be associated with poorly functioning kidneys. Hydronephrosis can affect one (unilateral) or both (bilateral) kidneys, and it resolves on its own in about half of all cases.
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