Several things:: Blockage of the ureter (e.g. Stones, tumors, valves) can lead to accumulation of fluid in the urinary space, leading to the most common form of enlargement called hydronephrosis. Severe urine reflux from the bladder can cause this as well. The organ itself can be enlarged in inflammation, such as a kidney infection; infiltration by cancer; or if there is a large or multiple kidney cysts.
Answered 10/5/2015
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Diabetes, PKD etc: Diabetes, PKD, and any situation where the other kidney is not working and therefore the one which is working becomes larger to take the extra work.
Answered 12/30/2014
3.4k views
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