Robotic-assisted partial nephrectomy (RAPN) is an operation that removes a kidney tumour together with a small rim of healthy tissue and leaves the rest of the kidney in place. For suitable tumours it is the preferred way to treat Kidney Cancer, because it protects long-term kidney function without compromising cancer control.
This article explains who is suitable for RAPN, how the operation is done, what the risks are and what recovery and follow-up involve. For the broader comparison with removing the whole kidney, see Partial vs radical nephrectomy.
Who is suitable for RAPN?
RAPN is most often advised for localised kidney tumours, typically up to 7 cm (stage T1), and especially those 4 cm or smaller. It is particularly valuable if you have:
- A single functioning kidney
- Tumours in both kidneys
- Existing kidney disease, diabetes or high blood pressure
- A hereditary condition that can cause several kidney tumours
Whether a particular tumour can be removed with the kidney saved depends on more than size. Surgeons also consider where the tumour sits: tumours on the outer surface are easier than those deep in the centre, close to the main blood vessels or the urine-collecting system. Scoring systems such as R.E.N.A.L. and PADUA describe this complexity and help plan the operation.
Some tumours need a radical nephrectomy instead, for example when the tumour extends into the renal vein or beyond the kidney. Selected very small tumours in older or frail patients may be watched with scans (active surveillance) or treated by ablation.
Related: Kidney Cancer · Robotic Surgery
How to prepare
Before surgery you will usually need:
- A contrast CT or MRI of the kidneys, so the surgeon can plan around the tumour and its blood vessels
- Blood tests including kidney function (creatinine and eGFR), and sometimes a scan that shows how much each kidney contributes
- A fitness assessment for anaesthesia, including a review of blood thinners and other medicines
Stop smoking and keep walking daily. If you take blood thinners or diabetes medicines, ask exactly what to do on the days around surgery.
What happens during the operation?
The operation is done under general anaesthesia through several small cuts. The surgeon sits at a console next to the patient and controls every movement of the instruments.
- Access. Small ports are placed and the robot is docked. The kidney is reached either through the abdominal cavity or from behind it, depending on the tumour position and your anatomy.
- Expose the kidney. The kidney is freed from surrounding fat and the tumour is identified, often with an ultrasound probe placed inside.
- Control blood flow. When needed, the artery to the kidney is clamped briefly so the tumour can be removed with little bleeding. Surgeons aim to keep this time as short as possible; some tumours can be removed with selective or no clamping.
- Remove the tumour. The tumour is cut out with a rim of healthy tissue so that the edge is clear of cancer.
- Repair the kidney. The defect is closed in layers with fine stitches to control bleeding and seal the urine-collecting system.
- Unclamp and check. Blood flow is restored, bleeding is checked and the tumour is removed in a bag.
Most operations take about two to three hours, depending on the tumour. A drain may be left near the kidney for a day or two.
Why use the robot for partial nephrectomy?
Partial nephrectomy is one of the more technically demanding urological operations because the surgeon must remove the tumour precisely, control bleeding and rebuild the kidney quickly. The robot gives a magnified three-dimensional view and wristed instruments that make precise cutting and suturing easier. Compared with open surgery, minimally invasive partial nephrectomy generally means smaller wounds, less blood loss and a shorter hospital stay, with comparable cancer control in suitable patients.
What are the risks?
All operations carry risks. After partial nephrectomy these include:
- Bleeding, which can occasionally appear days later and may need a procedure or transfusion
- Urine leak from the repaired kidney, usually managed with a drain or a stent
- A tumour margin that is not completely clear, which is uncommon and is often managed by close follow-up
- A temporary or small permanent reduction in kidney function, usually much less than after removing the whole kidney
- Infection, blood clots, hernia at a port site, and the general risks of anaesthesia
- Conversion to open surgery or to removal of the whole kidney if the tumour cannot be removed safely
Your surgeon will discuss the risks that apply to your tumour and your general health before you consent.
Recovery
- You will usually walk on the day of surgery or the next day.
- The hospital stay is typically two to four days.
- Return to desk work is usually in two to three weeks, with heavy lifting avoided for about four to six weeks.
- Call your surgeon or attend hospital urgently for heavy blood in the urine, severe flank pain, fever or dizziness in the first weeks.
Related: What recovery after kidney surgery looks like
After the operation
The pathology report confirms the tumour type, grade, stage and whether the margins are clear. Not every small kidney mass is cancer; a proportion are benign. Follow-up is by periodic scans and kidney function tests, with the schedule set by the risk category of the tumour. Some high-risk tumours may be considered for additional treatment.
Guidelines
This article is consistent with the EAU Renal Cell Carcinoma guidelines and the AUA guideline on the management of localised renal masses.
Consultation
Dr. Anshuman Singh, Uro-Oncologist & Robotic Surgeon, performs robotic partial nephrectomy in Lucknow and sees patients at the Uro-Oncology OPD, Chandan Hospital (10 AM – 4 PM) and at Uro-Onco Connect, Gomti Nagar (6 – 9 PM), Monday to Friday, and by teleconsultation. CT or MRI scans and blood reports can be shared in advance. Book a consultation.
Frequently asked questions
What does RAPN stand for?
Robot-assisted partial nephrectomy: removal of a kidney tumour with a rim of healthy tissue, preserving the rest of the kidney, using a robotic surgical system.
Is robotic partial nephrectomy better than removing the whole kidney?
For suitable tumours, especially small ones, cancer control is generally comparable and kidney function is better preserved. Whether it is possible depends on the tumour's size and position.
How long does RAPN take, and how long is the hospital stay?
The operation usually takes about two to three hours, and most patients stay two to four days.
What is the risk of losing the kidney during RAPN?
It is uncommon. Occasionally the surgeon has to remove the whole kidney if the tumour cannot be removed safely or bleeding cannot be controlled. This is discussed and consented to beforehand.
Will my kidney function change?
Some reduction is expected because tumour and some kidney tissue are removed, but it is usually much smaller than after removing the whole kidney. Your function is monitored with blood tests.
What follow-up will I need?
Periodic scans and kidney function tests, with the interval depending on the tumour's pathology. Your surgeon will give you a schedule.
Treatment in Lucknow
Dr. Anshuman Singh is a Uro-Oncologist and Robotic Surgeon in Lucknow. Read about Kidney Cancer treatment in Lucknow and Robotic Surgery for Urological Cancers, or book a consultation in person or by teleconsultation.
This article is for general education and does not replace a personal medical consultation.