I presume you are referring to a kidney cortical cyst.
A cyst is like a bubble and cortical cyst means it arises from the cortex of the kidney, which is in a way the more superficial aspect of the kidney.
Cysts can either be simple and complex. When we refer to a cyst as being complex, we are concerned about its potential of being cancerous or malignant.
Of course, if the cyst is malignant, we would have to intervene and this can range from ablative techniques (either freezing or melting) to surgery (partial nephrectomy, removing part of the kidney and if not suitable, radical nephrectomy, where the entire kidney has to be removed)
For non-cancerous cysts, if the cyst is causing symptoms eg back pain or if the cyst is causing blockage to the flow of urine from the respective kidney (eg hydronephrosis), we can marsupialise the cyst (ie decompress it and remove part of the cyst wall to prevent recurrence).
These procedures can be done with key-hole (laparoscopic) surgeries when suitable.
Do see a urologist to get the cyst assessed. We will advice the next step of treatment accordingly.
