Partial Versus Radical Nephrectomy: Why Is Part or All of the Kidney Removed?

A kidney tumor does not automatically mean that the entire kidney must be removed. In many cases, surgeons can remove the growth and preserve the healthy part of the kidney. In other situations, removing the whole kidney provides the safest and most reliable treatment.

This is the basic difference between partial nephrectomy and radical nephrectomy.

A partial nephrectomy removes the tumor or diseased portion of the kidney while leaving the remaining healthy kidney tissue in place. A radical nephrectomy removes the entire affected kidney, usually together with some of the surrounding fatty tissue. Additional structures, such as the adrenal gland or nearby lymph nodes, are removed only when there is a medical reason to do so.

The decision is not based solely on how many centimetres the tumor measures. Its exact location, depth, relationship to blood vessels, cancer stage, function of the opposite kidney, and the patient’s overall health can all affect which operation is recommended.

For a small, localized kidney tumor, preserving part of the kidney is generally preferred when it can be done safely. However, kidney preservation should not come at the expense of incomplete cancer removal or an unnecessarily dangerous operation. ^[1][2]

Nephrectomy is the medical term for the surgical removal of part or all of a kidney. It is most commonly performed to treat kidney cancer or a kidney mass suspected of being cancerous.

The procedure may also be needed when a kidney has become severely damaged by infection, stones, obstruction, injury, congenital abnormalities, or loss of blood supply. A person donating a kidney for transplantation also undergoes nephrectomy. ^[3][6]

The main types of kidney removal surgery include:

• Partial nephrectomy: Removal of the tumor or abnormal portion of the kidney while preserving the rest of the organ.
• Simple nephrectomy: Removal of the entire kidney, generally for a noncancerous but severely damaged or nonfunctioning kidney.
• Radical nephrectomy: Removal of the entire kidney and surrounding fatty tissue as part of cancer treatment.
• Donor nephrectomy: Removal of a healthy kidney for transplantation into another person.

When someone has a localized kidney tumor, the main surgical question is usually whether a partial nephrectomy can remove the tumor safely or whether a radical nephrectomy is necessary.

Partial nephrectomy is also called kidney-sparing surgery or nephron-sparing surgery. Nephrons are the microscopic filtering units within the kidneys. Preserving more kidney tissue generally means preserving more of these filtering units.

During partial nephrectomy, the surgeon removes:

• The kidney tumor
• A narrow margin of surrounding tissue
• Any immediately involved tissue necessary to achieve complete removal

The remaining portion of the kidney stays inside the body. The surgeon controls bleeding, closes any opening created in the urine-collecting system, and reconstructs the remaining kidney tissue.

The purpose of partial nephrectomy is not simply to perform a smaller operation. Its goal is to remove the abnormal growth completely while saving as much functioning kidney tissue as possible.

European Association of Urology guidance recommends partial nephrectomy for stage T1 kidney tumors when technically feasible. These are tumors measuring seven centimetres or less that remain limited to the kidney. Partial nephrectomy may also be considered for selected larger tumors, especially when the person has only one functioning kidney or already has chronic kidney disease. ^[1]

Radical nephrectomy removes the entire affected kidney. The fatty tissue surrounding the kidney and the tissue covering known as Gerota’s fascia may also be removed.

Traditional descriptions of radical nephrectomy sometimes state that the operation includes removal of the adrenal gland above the kidney and nearby lymph nodes. Modern kidney cancer surgery is more selective.

The adrenal gland does not generally need to be removed when imaging shows no evidence that cancer has reached it. Routine lymph node removal is also not recommended for every person with cancer confined to the kidney. Suspicious or enlarged lymph nodes may be removed to determine whether cancer has spread or to remove visible disease. ^[1]

Radical nephrectomy may be recommended when:

• The tumor is too large for safe partial removal
• Most of the kidney has been replaced by the tumor
• The tumor lies deep in the centre of the kidney
• Major kidney blood vessels are involved
• The cancer has grown beyond the kidney
• Too little healthy kidney tissue would remain after partial removal
• The affected kidney is already functioning poorly
• Partial nephrectomy would create an unacceptable risk of bleeding, urine leakage, or incomplete tumor removal

Removing the whole kidney may also be necessary for a severely damaged, chronically infected, obstructed, or nonfunctioning kidney that continues to cause symptoms. ^[6]

The kidneys do much more than produce urine. They remove waste products and excess fluid from the blood, maintain electrolyte balance, help regulate blood pressure, stimulate red blood cell production, and support bone health.

Most people can live a healthy life with one properly functioning kidney. However, that does not mean kidney tissue is unimportant or disposable.

Preserving kidney tissue provides additional functional reserve. This may become valuable later if the person develops high blood pressure, diabetes, cardiovascular disease, kidney stones, another kidney tumor, or age-related reduction in kidney function.

Compared with radical nephrectomy, partial nephrectomy generally preserves more kidney function and reduces the amount of functioning kidney tissue lost during surgery. For appropriately selected early-stage kidney cancers, partial nephrectomy can provide cancer control comparable to removal of the entire kidney. ^[4][7]

Kidney preservation is especially important for people who have:

• Only one functioning kidney
• Tumors in both kidneys
• Chronic kidney disease
• Reduced kidney function before surgery
• Diabetes or high blood pressure
• A hereditary condition associated with repeated kidney tumors
• A strong risk of kidney disease in the future
• A relatively young age and many years of expected kidney use ahead

The aim is to treat the current tumor without unnecessarily increasing the patient’s risk of future kidney problems.

Partial nephrectomy is commonly preferred for small kidney tumors, particularly tumors measuring four centimetres or less.

These tumors are often classified as stage T1a when they remain confined to the kidney. Partial nephrectomy is usually recommended when the tumor can be removed with a satisfactory margin while leaving behind a useful amount of healthy kidney tissue. ^[1][2]

Tumors between four and seven centimetres may also be suitable for partial nephrectomy. Some even larger tumors can be treated with kidney-sparing surgery in carefully selected patients.

A size measurement on a scan is therefore only the beginning of the decision.

A tumor that projects outward from the surface of the kidney is often easier to remove without damaging important internal structures.

The surgeon may be able to separate the tumor from the surrounding healthy tissue while avoiding the major arteries, veins, and urine-collecting system in the centre of the kidney.

By comparison, a smaller tumor buried deep within the kidney may be more technically challenging than a somewhat larger tumor growing outward from its edge.

A solitary kidney may be the only kidney a person was born with, the only kidney that functions, or the remaining kidney after previous surgery.

Removing an entire solitary functioning kidney would leave the person without adequate natural kidney function. Dialysis or kidney transplantation would then be required.

Surgeons may therefore attempt partial nephrectomy for a difficult tumor in a solitary kidney when preserving kidney function would not be as critical in someone with two healthy kidneys.

People living with one kidney are generally advised to have their blood pressure and kidney function monitored. Urine and blood tests may be used to detect early signs of kidney stress or declining filtration. ^[5]

When tumors are present in both kidneys, removing both organs would result in kidney failure. Surgeons may perform partial nephrectomy on one or both sides to retain enough functioning kidney tissue.

The procedures may be performed during separate operations, depending on the size and urgency of each tumor, the patient’s kidney function, and the complexity of surgery.

Certain inherited conditions can cause multiple kidney tumors to develop over a person’s lifetime.

If the entire kidney were removed for the first small tumor, fewer treatment options might remain if another tumor developed in the opposite kidney. Repeated kidney-sparing procedures may therefore be considered to preserve as much kidney function as possible.

A person who already has impaired kidney filtration has less reserve to lose. Removing an entire kidney may cause a substantial further reduction in kidney function.

Partial nephrectomy may be favored when it is technically safe because it can preserve more functioning tissue and potentially reduce the risk of advanced chronic kidney disease. ^[2][4]

Patients may understandably wonder why the whole kidney must be removed when partial nephrectomy is available. Radical nephrectomy is generally recommended because of the characteristics of the tumor or the condition of the kidney—not because partial nephrectomy was overlooked.

A large tumor may occupy most of the kidney, leaving only a small amount of normal tissue.

Even if that tissue could technically be preserved, it may not receive enough blood or provide meaningful kidney function after reconstruction. Attempting partial removal may also increase the risks of severe bleeding, urine leakage, and incomplete cancer removal.

Tumors larger than seven centimetres are classified as stage T2 when still limited to the kidney. Guidelines support radical nephrectomy for localized stage T2 tumors that cannot be treated safely with partial nephrectomy. ^[1]

The central region of the kidney contains important structures, including:

• The main kidney artery
• The main kidney vein
• Branching blood vessels
• The renal pelvis
• The calyces that collect urine
• The beginning of the ureter

A tumor surrounded by these structures may be difficult to remove without damaging the remaining kidney.

The surgeon may determine that partial nephrectomy would leave a poorly functioning remnant, cause extensive urine leakage, or create an unacceptable risk of bleeding.

This explains why a centrally located four-centimetre tumor may require radical nephrectomy while a larger tumor projecting outward from the kidney may be removable with partial nephrectomy.

Kidney cancer can grow into the renal vein and sometimes into the inferior vena cava, the large vein that returns blood from the lower body to the heart.

When cancer extends into these major vessels, radical nephrectomy is generally required. The surgeon may also need to open the involved vein and remove the tumor growing inside it. ^[4][7]

Complex cases may require a coordinated surgical team and an open operation to obtain safe access to the affected blood vessels.

Radical nephrectomy may be necessary when cancer has grown into the fat surrounding the kidney, nearby tissues, the adrenal gland, or adjacent organs.

The operation is planned according to the structures actually involved. The adrenal gland is not automatically removed simply because it sits above the kidney. Current guidance advises against removing it when there is no clinical evidence of adrenal invasion. ^[1]

Similarly, lymph nodes are generally removed when they appear enlarged or suspicious rather than as a routine step in every localized kidney cancer operation.

Multiple tumors can make kidney-sparing surgery more difficult. Removing several separate areas may leave too little healthy tissue or require extensive reconstruction.

Partial nephrectomy may still be attempted in people with hereditary kidney cancer syndromes or a solitary kidney. In other cases, radical nephrectomy may be safer and more reliable.

If the affected kidney contributes very little to overall filtration, preserving part of it may offer limited benefit.

Doctors may use a nuclear kidney scan to determine how much work each kidney is performing. If the diseased kidney has almost no function and the other kidney is healthy, removing the whole affected kidney may be reasonable.

Not every nephrectomy is performed for cancer. An entire kidney may be removed when it has been permanently damaged by:

• Recurrent kidney infections
• Severe kidney stone disease
• Long-standing urinary obstruction
• Loss of blood supply
• Major trauma
• Congenital abnormalities
• Severe scarring
• Reflux of urine toward the kidney
• Uncontrolled bleeding
• Persistent pain arising from a nonfunctioning kidney

A nonfunctioning kidney does not always have to be removed. It may remain in the body if it causes no symptoms or complications. Removal is considered when the kidney becomes a continuing source of infection, pain, bleeding, obstruction, or difficult-to-control high blood pressure. ^[6]

It is tempting to think that small tumors receive partial nephrectomy and large tumors receive radical nephrectomy. Although tumor size matters, this rule is too simple.

Two tumors with the same diameter can require completely different operations.

A five-centimetre tumor growing outward from the lower edge of the kidney may be relatively straightforward to remove. Another five-centimetre tumor buried in the centre of the kidney and wrapped around major blood vessels may require removal of the entire organ.

Surgeons evaluate:

• Tumor diameter
• Depth within the kidney
• Distance from the urine-collecting system
• Relationship to major arteries and veins
• Whether the tumor is solid or cystic
• Whether more than one tumor is present
• Whether the tumor extends outside the kidney
• The amount of healthy tissue that would remain
• Whether the remaining tissue would have an adequate blood supply
• The expected function of the reconstructed kidney

The decision is therefore based on three-dimensional anatomy, not simply the largest number written on the scan report.

Detailed imaging shows the tumor’s size, location, blood supply, and relationship to surrounding tissues.

The scan can help identify whether the tumor has entered the renal vein, reached surrounding fat, affected the adrenal gland, or spread to lymph nodes or distant organs.

The surgeon often reviews the actual scan images rather than relying only on the written radiology report.

Blood tests measure serum creatinine and calculate estimated glomerular filtration rate. Urine testing may identify albumin or protein, which can indicate kidney damage.

When the contribution of each kidney is uncertain, a nuclear kidney scan may be performed to measure separate kidney function.

The treatment plan should consider more than the present tumor. Diabetes, high blood pressure, cardiovascular disease, obesity, smoking, older age, and existing chronic kidney disease may increase the likelihood of future kidney function decline.

Preserving kidney tissue may be especially valuable in someone who already has several of these risk factors.

Not every kidney mass is cancerous. Some tumors, including certain oncocytomas and fat-containing masses, may be benign.

A kidney mass biopsy may sometimes be performed before treatment, particularly when the result could change whether the patient undergoes surgery, tumor ablation, or active surveillance.

However, biopsy is not necessary in every case, and some kidney masses remain difficult to classify with complete certainty before removal.

Partial nephrectomy is usually more technically demanding than radical nephrectomy. The surgeon must remove the tumor, control bleeding, repair the kidney’s collecting system when necessary, and reconstruct the remaining tissue.

Experience can be particularly important for centrally located, multiple, or larger tumors. European guidance notes that hospital surgical volume may influence outcomes such as complications, surgical margins, and the length of time the kidney’s blood supply is interrupted. ^[1]

A second opinion from a surgeon experienced in complex kidney-sparing surgery may be helpful when preserving kidney function is especially important.

Partial nephrectomy preserves more kidney tissue, but it is not automatically the safest operation for every patient.

Potential complications include:

• Bleeding from the cut surface of the kidney
• Urine leakage from the collecting system
• Damage to the blood supply of the remaining tissue
• Infection
• Temporary reduction in kidney function
• A positive surgical margin
• Need for another procedure
• Conversion to radical nephrectomy

During partial nephrectomy, the kidney artery may be temporarily clamped to limit bleeding while the tumor is removed. Surgeons try to minimize the duration of reduced blood flow and preserve the greatest possible volume of healthy tissue.

Partial nephrectomy can therefore be a more complicated operation even though less of the kidney is removed. ^[7]

The best operation is the one that achieves complete tumor removal, protects the patient from unnecessary surgical risk, and preserves useful kidney function whenever reasonably possible.

Yes. Occasionally, a surgeon plans to perform partial nephrectomy but must remove the entire kidney during the operation.

This may happen because of:

• Unexpected tumor extension
• Involvement of important blood vessels
• Uncontrolled bleeding
• Inability to achieve a satisfactory cancer margin
• Extensive damage to the remaining kidney
• Inadequate blood supply to the preserved tissue
• Unexpected anatomical difficulty

Conversion does not necessarily mean that something went wrong. It may represent the safest response to findings that could not be fully predicted from preoperative imaging.

Patients should ask about the likelihood of conversion before surgery and understand what circumstances would make radical nephrectomy necessary.

For a small, localized tumor that can be completely removed through partial nephrectomy, taking out the entire kidney has not been shown to provide better cancer-specific control.

In appropriately selected patients with early-stage kidney cancer, partial nephrectomy can produce cancer outcomes comparable to radical nephrectomy while preserving more kidney function. ^[4][7]

Radical nephrectomy becomes the better cancer operation when partial removal might:

• Leave tumor behind
• Rupture or disrupt the tumor
• Compromise the surgical margin
• Cause excessive bleeding
• Leave behind a poorly functioning kidney remnant
• Make the operation substantially more dangerous

The term “radical” does not mean that the operation is always more effective. It means that a greater amount of tissue is removed.

Partial and radical nephrectomy can be performed through different surgical approaches.

Open nephrectomy is performed through one larger incision in the abdomen, side, or back.

It may be recommended for very large tumors, tumors involving major blood vessels, extensive cancer outside the kidney, or anatomy requiring direct and wide surgical access.

Laparoscopic surgery uses several small incisions, a camera, and long surgical instruments. One incision is enlarged sufficiently to remove the kidney or tumor.

Compared with open surgery, laparoscopic nephrectomy is often associated with less postoperative pain and faster early recovery when it is suitable for the tumor and performed by an experienced surgeon. ^[6][7]

Robot-assisted surgery is also performed through several small incisions. The surgeon controls highly flexible instruments from a surgical console.

The robotic platform can assist with the precise cutting, suturing, and reconstruction required during partial nephrectomy. However, the robot does not perform the operation independently, and its use does not determine whether part or all of the kidney should be removed.

Tumor complexity, surgical safety, and the surgeon’s experience remain more important than the name of the surgical technology.

After partial nephrectomy, the operated kidney may temporarily function less efficiently because of swelling, tissue removal, and temporary interruption of blood flow. Kidney function often stabilizes during recovery.

After radical nephrectomy, the remaining kidney takes over a greater share of filtration. It may gradually enlarge and increase its workload.

Most people with one healthy remaining kidney do not require dialysis and can continue normal daily activities. However, having one kidney makes it particularly important to monitor kidney function and protect the remaining organ. ^[5]

Long-term monitoring may include:

• Blood pressure checks
• Serum creatinine testing
• Estimated glomerular filtration rate
• Urine testing for albumin or protein
• Imaging follow-up after kidney cancer
• Review of medicines that may affect kidney function

People with chronic kidney disease, persistent urine protein, poorly controlled high blood pressure, or significant diabetes may also need follow-up with a kidney specialist.

Most people can work, travel, exercise, and live an active life with one healthy kidney.

A highly restrictive diet is not automatically required after radical nephrectomy. The person’s dietary needs depend on the function of the remaining kidney, blood pressure, urine protein levels, diabetes status, and other medical conditions.

General measures for protecting a solitary kidney include:

• Controlling blood pressure
• Managing diabetes
• Avoiding smoking
• Maintaining a healthy body weight
• Avoiding excessive salt intake
• Staying adequately hydrated
• Avoiding unnecessary very-high-protein diets
• Discussing supplements with a healthcare professional
• Using pain medicines cautiously
• Attending regular kidney-function reviews

Frequent or high-dose use of certain nonsteroidal anti-inflammatory pain medicines can damage the kidneys, particularly during dehydration or illness. People with one kidney should inform healthcare professionals about their solitary kidney before starting new medicines or undergoing procedures that may affect kidney function. ^[5]

A patient considering kidney surgery may want to ask:

• Why are you recommending partial nephrectomy or radical nephrectomy?
• Is the tumor’s size or location making kidney preservation difficult?
• How much healthy kidney tissue would remain after partial nephrectomy?
• How well is the opposite kidney functioning?
• Could a kidney mass biopsy change the treatment plan?
• What is the likelihood that partial nephrectomy will be converted to radical nephrectomy?
• Will the adrenal gland be removed?
• Will lymph nodes be removed?
• Is open, laparoscopic, or robot-assisted surgery most appropriate?
• How often do you perform complex partial nephrectomy?
• What are the risks of urine leakage or bleeding?
• How much kidney function may be lost?
• Will a kidney specialist be involved after surgery?
• Would a second surgical opinion be reasonable?

The recommendation should be based on the patient’s actual imaging, kidney function, tumor characteristics, and long-term health risks.

No. Many localized kidney tumors can be removed with partial nephrectomy. Very small masses may sometimes be monitored or treated with tumor ablation, depending on the patient’s health, age, tumor characteristics, and preferences.

Possibly. Tumors measuring up to seven centimetres are classified as stage T1 when they remain confined to the kidney. Whether partial nephrectomy is possible depends greatly on location, depth, blood vessel involvement, and the amount of healthy tissue that would remain. ^[1]

Selected larger tumors may be treated with partial nephrectomy, especially in patients with a solitary kidney or chronic kidney disease. However, the operation may be technically complex and is not appropriate for every large tumor.

Partial nephrectomy can be curative for appropriately selected localized kidney cancers when the entire tumor is removed with an adequate margin. ^[4]

No. The adrenal gland is generally preserved when there is no clinical or imaging evidence that cancer has invaded it. ^[1]

Most people do not need dialysis if the remaining kidney functions adequately. Dialysis becomes necessary when the remaining kidney is absent or unable to provide sufficient filtration.

Not necessarily. Partial nephrectomy removes less kidney tissue but may involve more complex reconstruction. Recovery is also influenced by whether the operation is open or minimally invasive, the size of the incision, complications, and the patient’s general health.

Partial nephrectomy and radical nephrectomy are not competing operations in which one is always good and the other is always bad.

Partial nephrectomy removes the tumor while preserving healthy kidney tissue. It is generally preferred for localized stage T1 kidney tumors when it can be performed safely. Kidney preservation becomes particularly important for people with a solitary kidney, chronic kidney disease, tumors in both kidneys, or a high risk of future loss of kidney function.

Radical nephrectomy removes the entire affected kidney. It may be necessary when the tumor is large, deeply central, involved with major blood vessels, extending outside the kidney, or surrounded by too little healthy tissue to preserve safely.

The operation chosen should provide reliable cancer control without exposing the patient to unnecessary risk. In some cases, that means saving most of the kidney. In others, removing the whole kidney is the safest way to achieve complete treatment.

A detailed review of the imaging with an experienced urologic surgeon can help the patient understand exactly why partial or radical nephrectomy has been recommended.

This article is intended for general educational purposes and should not replace individualized medical advice from a urologist, kidney specialist, or cancer care team.

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