CPT® Code 50390

The procedure described by CPT® Code 50390 involves the aspiration and/or injection of a renal cyst or the renal pelvis using a percutaneous approach. This procedure is primarily utilized to manage renal cysts, which are fluid-filled sacs that can develop in the kidneys. While many simple renal cysts are benign and do not cause symptoms, they can sometimes lead to discomfort or complications. Symptoms that may necessitate this procedure include flank pain, frequent urination, or hematuria (blood in the urine). During the procedure, the skin over the kidney is first cleansed to reduce the risk of infection. A local anesthetic is then administered to minimize discomfort. Under the guidance of imaging techniques, a needle is carefully inserted to reach the cyst or renal pelvis. If the procedure involves aspiration of urine from the renal pelvis, the needle is directed into that area to extract the fluid. In cases where a renal cyst is being treated, the needle is advanced into the cyst to aspirate the cystic fluid, which is subsequently sent for laboratory analysis. Following aspiration, contrast material may be injected to assess for any communication between the cyst and the kidney's collecting system. If no such communication is found, a sclerosing agent, typically 95% ethanol, is injected into the cyst to promote closure and prevent recurrence. The sclerosing solution is retained in the cyst for a brief period before being removed, completing the procedure.