Renal Cyst

Renal cysts are sacs of fluid that form in the kidneys. They are usually characterized as “simple” cysts, meaning they have a thin wall and contain water-like fluid. Renal cysts become fairly common as people age and usually do not cause symptoms or harm.
Because they rarely cause symptoms, renal cysts are most often found during imaging tests performed for other reasons. Some renal cysts may appear more complex and have a thicker wall or contain solid material instead of fluid. Your doctor will likely perform additional imaging tests to monitor complex renal cysts and distinguish benign cysts from cancer. These tests may include abdominal or pelvic ultrasound, abdominal and pelvic CT, or body MRI. Renal cysts are usually left alone and do not require treatment unless they are causing symptoms or harming kidney function. If treatment is required, your doctor may use sclerotherapy or surgery to drain the cyst and take steps to prevent its recurrence.