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Benign kidney cyst

Also known as Cyst Of Kidney and Simple Renal Cyst

A cyst is a fluid-filled sac. There are two types of kidney cysts.

Polycystic kidney disease (PKD) runs in families. In PKD, the cysts take the place of the normal tissue. They enlarge the kidneys and make them work poorly, leading to kidney failure. When PKD causes kidneys to fail—which usually happens after many years—people need dialysis or kidney transplantation. About half of people with the most common type of PKD end up with kidney failure. PKD also causes cysts in other parts of the body, such as the liver.

Symptoms of PKD include

  • Pain in the back and lower sides
  • Headaches
  • Urinary tract infections
  • Blood in the urine

Doctors diagnose PKD with imaging tests and family history. Treatments include medications, and, when people with PKD develop kidney failure, dialysis or kidney transplants.

Acquired cystic kidney disease (ACKD) usually happens in people who are on dialysis. Unlike PKD, the kidneys are normal sized, and cysts do not form in other parts of the body. People with ACKD already have chronic kidney disease when they develop cysts. ACKD often has no symptoms. In most cases, the cysts are harmless and do not need treatment.

NIH: National Institute of Diabetes and Digestive and Kidney Diseases

Source: MedlinePlus

What are the symptoms?

Within all the people who go to their doctor with benign kidney cyst, 60% report having side pain, 57% report having sharp abdominal pain, and 49% report having blood in urine. The symptoms that are highly suggestive of benign kidney cyst are side pain, blood in urine, symptoms of the kidneys, involuntary urination, kidney mass, symptoms of prostate, excessive urination at night, and impotence, although you may still have benign kidney cyst without those symptoms.

What might my doctor prescribe?

Common Tests and Procedures

Patients with benign kidney cyst often receive radiographic imaging procedure, urinalysis, hematologic tests, x-ray computed tomography, complete blood count, electrolytes panel, intravenous fluid replacement and glucose measurement .

Common Medications

The most commonly prescribed drugs for patients with benign kidney cyst include tamsulosin (flomax), pioglitazone (actos), glucosamine, tolterodine (detrol), glimepiride, amlodipine / benazepril, tiotropium (spiriva), nystatin topical product, ibandronate (boniva), pentosan polysulphate sodium (elmiron), darifenacin (enablex), hydrochlorothiazide / valsartan and dutasteride (avodart) .

Who is at risk?

Groups of people at highest risk for benign kidney cyst include race/ethnicity = other, age 75+ years and age 60-74 years. On the other hand, age 5-14 years, age 1-4 years, and age < 1 years almost never get benign kidney cyst.


< 1 years
1-4 years
5-14 years
15-29 years
30-44 years
45-59 years
60-74 years
75+ years




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