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Kidney cyst can be simple or complex.
Simple cysts are usually single with smooth walls & is a common finding after 50 years of age.
They usually do not produce symptoms and may be detected first time by CT or other imaging studies.
In complex cysts the walls are not smooth, there may be walls within it etc.
Some of the complex cysts can be cancerous.
In some cases the walls of the cyst can get calcium deposition when it is called calcified cyst.
Normal kidneys can contain upto 5 cysts.
More cysts can cause symptoms.
It can predispose to infection, compromise the function of the kidney.
Treatment will depend on the problem caused by the cysts, nature of the cysts etc.
Usually the urologist will consult the radiologist about the shape & characteristics of the cyst & can select to do biopsy to determine the nature.