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cysts in the kidney found during ultrasound

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Gender: Female. Age: 74. Results of ultrasound of liver and gallbladder happened to incidentally noted bilateral simple renal cysts. Cysts in both kidneys. Largest on the right measuring 4.2 x 6.1 x 3.8 cm in the interpolar region. On the left, largest lies in the lower pole measuring 1.5 x 1.6 x 1.3 cm.
Urine test results: Protein is 1+, Glucose is 2+, WBC in urine is 32, RBC in urine is 0, EC in urine is 0, crystals is not seen, casts is not seen, other formed element is seen, micro organism is 2+. In 2002, CT scan shows a small cyst in the lower pole of the left kidney and measurement was not given in the report. In the expected course of the lower right ureter, in the pelvis below the level of the pelvic brim, there is a 3mm dense opacity of calcific density seen which could be a small ureteric calculus.

Dear Doctor,
Appreciate if you could advise what is the best action required to take. Does the above findings implies that medical attention is required for that large cyst or it is very common to have such large size cysts in kidneys. Is it benign or maligant? Need to remove the cysts? Thank you very much.
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replied July 30th, 2017
A cyst is a fluid filled round bag-like structure.

Renal cysts occur in a variety of genetic diseases in adults and children, but "simple renal cysts" are commonly observed in normal kidneys. They are so common, it is difficult to consider them a disease.

The simple kidney cyst is a fluid filled spherical space within the kidney. A simple kidney cyst has no risk of becoming a kidney cancer and is therefore nothing to worry about. Usually as age progresses 50% of most adults develop cysts in the kidneys which increase in size as well.

Simple kidney cysts have no clinical implications. Usually, simple kidney cysts do not result in any symptoms and cause no harm to the body. On rare occasions, a cyst may cause symptoms such as flank pain, but this is quite unusual. If a simple kidney cyst is believed to cause pain or another symptom, it can usually be treated by a radiologist who can perform aspiration and sclerosis of the simple kidney cyst under radiographic guidance with ultrasound or CT scanning.
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