Does a 10cm kidney cyst require treatment?

Simple or Complex? Renal cysts are frequently observed in normal kidney (65-70% of cases). The size of the cyst is less important than character. Cysts can have different character appearances on different diagnostic studies (ultrasound, CT scan, or MRI). Based on what yours looks like, your doctor will either choose to follow it or perform additional imaging as they can also be a sign of more serious disorders.