Introduction

Kidney cysts are round pouches of fluid that form on or in the kidneys. Kidney cysts can be associated with serious disorders that may impair kidney function. But more commonly, kidney cysts are a type called simple kidney cysts — noncancerous cysts that rarely cause complications.

Simple kidney cysts are often detected during an imaging test performed for another condition. Simple kidney cysts that don't cause signs or symptoms usually don't require treatment.

Symptoms

Simple kidney cysts typically don't cause signs or symptoms. If a simple kidney cyst grows large enough, symptoms may include:

• Dull pain in your back or side
• Fever
• Upper abdominal pain

Causes

It's not clear what causes simple kidney cysts. One theory suggests that kidney cysts develop when the surface layer of the kidney weakens and forms a pouch (diverticulum). The pouch then fills with fluid, detaches and develops into a cyst.

Risk factors

The risk of having simple kidney cysts increases as you get older, though they can occur at any age. Simple kidney cysts are more common in men.

• Complications
• Kidney cysts can occasionally lead to complications, including:
• An infected cyst. A kidney cyst may become infected, causing fever and pain.
• A burst cyst. A kidney cyst that bursts causes severe pain in your back or side.
• Urine obstruction. A kidney cyst that obstructs the normal flow of urine may lead to swelling of the kidney (hydronephrosis).

Diagnosis

Tests and procedures used to diagnose simple kidney cysts include:

Imaging tests. Imaging tests, such as an ultrasound, a computerizedss tomography (CT) scan and magnetic resonance imaging (MRI), are often used to investigate simple kidney cysts. Kidney function tests. Testing a sample of your blood may reveal whether a kidney cyst is impairing your kidney function.

Treatment may not be necessary

If your simple kidney cyst causes no signs or symptoms and doesn't interfere with your kidney function, you may not need treatment.

Treatments for cysts that cause signs and symptoms

Puncturing and draining the cyst, then filling it with alcohol. Rarely, to shrink the cyst, your doctor inserts a long, thin needle through your skin and through the wall of the kidney cyst. Then the fluid is drained from the cyst. Surgery to remove the cyst: A large or symptomatic cyst may require surgery to drain and remove it. To access the cyst, the surgeon makes several small incisions in your skin and inserts special tools and a small video camera. While watching a video monitor in the operating room, the surgeon guides the tools to the kidney and uses them to drain the fluid from the cyst. Then the walls of the cyst are cut or burned away.

Conclusion

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Journal of Kidney Treatment and Diagnosis