Brain Metastasis


Although most patients with metastatic kidney cancer never get brain metastasis, it is also far from rare, and it’s a special and serious situation. I am including a separate article because it looks to me like many patients with this problem are not getting the most effective therapies for this problem, specifically I think whole brain radiation is ineffective either as sole treatment or as mop-up therapy, and can have catastrophic long term side- effects. I also think that another form of radiation, stereotactic radiosurgery, can be effective in more cases than is often realized.

Diagnosis and Initial Treatment


The diagnosis of brain metastasis is usually triggered by your reporting symptoms since brain scans are not normally included in routine follow-up testing. For a few kidney cancer patients, symptoms of brain metastasis are the first sign they have cancer.

Typically, your doctor will give you a simple neurological exam, which involves things like testing reflexes, vision, muscle strength, gait, mental status and so on. Depending on the symptoms, history, and results of the exam, if there is concern MRI or CT scan of the brain may be ordered. MRI is usually considered to be the better test.

Should Routine Follow-Up Include a Brain Scan?

Patients who have no history of brain metastasis don't normally get a brain scan as part of their routine follow-up exams. Although that's standard practice it seems fair to ask why. I don't know the answer but I suspect it's because brain metastasis usually causes symptoms when fairly small anyway, and most patients with brain metastasis also have other metastases which are likely to be detected by other tests.

I am not advocating brain scans as part of routine follow-up at this time, but if it were to be done it'd make the most sense for patients who were in the intensive follow-up period in the few years after diagnosis with high risk RCC.

Brain Metastasis Symptoms

Brain metastasis is usually diagnosed after investigation of symptoms. Most patients do not get brain imaging as part of routine follow-up so usually brain metastasis is found is because the patient reports symptoms.


Sudden onset of neurologic symptoms other than something like a ordinary headache is a medical emergency! You could be having a stroke or another serious neurologic problem. If you are experiencing such symptoms, call 911 right now!

Special Note: If you are reading this page and have any of these symptoms, but aren't a cancer patient, then your chance of a brain metastasis or brain tumor is much less than for someone with a history of cancer. If you have unexplained neurologic symptoms you still need to see your doctor to get a diagnosis, possibly right now - see the alert above.

A brain metastasis can cause many different symptoms depending on where in the brain it’s located. No one specific symptom automatically means you have a brain metastasis. All of the symptoms below can also have other causes, including problems entirely unrelated to your kidney cancer, problems due to your cancer but not due to brain metastasis, and problems due to treatment side effects. Some of them are much more likely to be due to something else than to a brain metastasis. So please don’t assume you have a brain metastasis because you have a symptom listed here.

Instead, see your doctor who will evaluate your symptoms based on your history and treatments. You may be given a simple neurological exam and possibly other tests, especially an MRI or CT scan of the brain.

This list of symptoms is not a complete list but it should cover the more common symptoms of brain metastasis:

  • Vision problems such as double vision or partial blindness
  • Headaches possibly with nausea
    • Headaches are very common. Almost everyone gets a headache now and then and many people get headaches frequently. Headaches that fit your usual pattern are probably nothing to worry about. Call your doctor if you are having unusually severe or unusually frequent headaches or if the headaches are accompanied by other symptoms.
  • Numbness or tingling in part of the body
    • Note that numbness in the hands and feet is a side effect of a number of anti-cancer drugs.
  • Paralysis or difficulty moving any part of the body
  • Inability to walk
  • Difficulties with balance or unusual gait
  • Difficulty speaking, including slurring words or incoherent speech
  • Problems with thinking such as not being able to read a clock, or not being able to tell who and where you are etc.
  • Stupor – difficult to arouse
  • Seizure or convulsions

Initial Care

Before actual treatment starts, several things will probably be done to help relieve symptoms reduce any immediate risk of complications.

On Steroids: Often some of the symptoms from brain metastasis are the result of swelling caused by the tumor. Usually you will be given an oral steroid such as decadron to reduce swelling and symptoms. In addition to reducing swelling, decadron may improve your mood and energy, and greatly increase your appetite. Sometimes the mood changes are extreme though. You may also have trouble sleeping and it can cause high blood sugar, particularly in diabetics. Be sure to remind your doctor if you’re a diabetic. If the brain metastasis can be effectively treated, the steroids can be discontinued at some point after treatment. You can’t stop taking steroids all at once – the dose has to be reduced over a few weeks.

Anticonvulsant: If you had a seizure or are thought to be at risk of one, you will be also prescribed an anticonvulsant drug such as dilantin.

Treating the Brain Metastasis is The Top Priority: Even if there are tumors elsewhere in the body, the brain metastasis will usually be treated first, both because brain metastasis is life threatening and because the treatment is different from and often incompatible with treatment of tumors elsewhere. Some patients have brain metastasis as the only site of recurrence and so don’t have any other tumors to deal with. This situation naturally has a better prognosis than if there is also other metastasis.

Current Treatment May Be Stopped Or Interrupted: If you are on treatment for metastasis elsewhere, particularly if you’re on immunotherapy, the treatment will probably be interrupted. The steroids which are almost universally prescribed depress the immune system and abrogate the beneficial effect of immunotherapy, Interleukin-2 definitely included. It may be possible to resume immunotherapy after treatment is completed and you are off steroids. Appearance of a new brain metastasis would be considered progression in almost all clinical trials and is likely to mean you will be taken off study because of it. This doesn’t seem quite fair since many drugs do not cross the blood brain barrier and would not have been expected to affect growth of a brain metastasis anyway. Whether treatments can be continued or resumed is a case by case decision.

Main Treatment

Treatments for brain metastases include surgery and two very different types of radiation, stereotactic radiosurgery, and whole brain radiation. Surgery and stereotactic radiation are used to eliminate individual tumors, while whole brain radiation is intended to mop-up tumors too small to see yet, or as palliative treatment if other treatment isn’t possible. As you will see I am very skeptical that whole brain radiation has any benefit in kidney cancer and advise against it in most cases.


  • Typically surgery is used for 1-3 tumors.
  • Surgery can handle large tumors.
  • Whether surgery is possible depends on the location of the tumor
  • Surgery can be used even if whole brain radiation has been done, or stereotactic radiosurgery was done elsewhere in the brain.

Although brain surgery is notoriously technical and delicate that doesn’t mean it’s hard to go through. Having talked to several people who’ve been through brain surgery, and read the stories of several others, my impression is that often it is surprisingly easy to go through with only a few days in the hospital and relatively little pain. Obviously, this won’t always be the case, and risks of permanent neurological damage are always a consideration. The risks vary considerably depending on the precise situation.

Stereotactic Radiation

Stereotactic radiosurgery (SRS) isn’t actually surgery – it’s actually a high tech form of radiation therapy which effectively focuses very high doses of radiation on the tumor while sparing normal brain tissue. The good news is it’s very effective in RCC brain metastasis. There are actually several forms of radiosurgery, and I don’t feel qualified to discuss the pros and cons of each, however results seem to be good regardless of which system is used. Most studies report over 90% of treated tumors are “controlled” (which means they don’t grow), and most patients don’t die of brain metastasis. See the Stereotactic Radiosurgery References for details. After treatment tumors may be stable or be slowly absorbed.

The basic concept behind SRS is simple: A large number of beams are aimed from different places so that they converge on the tumor. The tumor then gets a much higher dose of radiation than the surrounding brain tissue. This dose is also much higher than can be achieved with whole brain radiation and is enough to overcome the high inherent resistance of RCC to radiation. While this basic principle is simple, ensuring that the beams are actually aimed at the tumor and that the zone of convergence exactly matches the shape of the tumor are highly technical.

Radiosurgery is usually done as a single outpatient procedure, although there may be appointments for assessment and planning first. In most forms of radiosurgery a metal frame is attached to your head (with screws!). This is actually the most painful part, and is reported to be not as bad as it sounds. The stereotactic frame allows precise and consistent determination of the position of your head during the procedure so that the tumor can be targeted accurately. The procedure itself is painless much like a CT scan. Afterwards you’ll probably be released after a short observation period. A little residual pain from the head frame is usually all you’ll feel. I’ve had reports of patients going out to dinner or shopping immediately after they’re released.

Some of the advantages of stereotactic radiosurgery are:

  • Usually a one day outpatient treatment with minimal pain.
  • Can treat multiple tumors
  • Can treat tumors which are difficult or impossible to get with surgery
  • Re-treatment is possible if new tumors appear
  • Can be used even if you’ve had whole brain radiation

Some of the limitations are:

  • Size Limit: Most references I’ve found give 3cm as the maximum size which can be treated, but because this technology is evolving rapidly, I would research this further if necessary.
  • Number of Tumors Treated: Well actually, in practice we find that although many sites limit the number of tumors that can be treated, but in fact SRS has been successfully used with over a dozen RCC brain metastases[Amendola 2000]. If you are told you have too many tumors to treat with SRS consider finding a site which is willing to go further.

Choosing Between Surgery and Stereotactic Radiosurgery

The choice between surgery and stereotactic RT when both are options, is obviously complex. I certainly can’t give definitive advice. It’s always important to get the guidance of expert physicians – here even more than usual.

A Few Thoughts

  • The surgery seems to me to be a more certain way to eliminate individual tumors, but is more difficult to go through although as I mentioned above, often less difficult than you might imagine. My impression is that surgery is usually advised if it’s feasible.
  • If you have metastases elsewhere and are planning on drug treatment, particularly immunotherapy, then it’s important to get off steroids as quickly as possible. While SRS requires less immediate recovery time, the tumor is not gone the instant SRS is completed, so it might be longer until swelling caused by the tumor resolves after successful treatment. I am not sure of this though. You should discuss it with your doctor! Likewise if the tumor is causing symptoms by increasing pressure within the cranium, surgery might resolve symptoms faster. Again discuss with your doctors.
  • If the location of the tumor makes surgery risky even though possible, then SRS may be the better bet.

Stereotactic Radiosurgery Resources

Whole Brain Radiation

Whole Brain Radiation is just what it sounds like: the whole brain is radiated in a series of treatments, usually one each day for a few weeks. While the treatment is not painful and usually doesn’t cause severe side effects immediately, there is a risk of severe long term damage to the brain. These late effects can begin months or years after the treatment and at worst can include a devastating generalized radiation necrosis with dementia and many other adverse effects.

Whole brain radiation is used in two different ways:

  • As Sole Treatment: I would say this is becoming less frequent which is good because the data I have seen shows that whole brain radiotherapy gives very poor results in kidney cancer metastatic to the brain with very poor survival and as well as poor control of the tumors as documented by the high percentage of patients who die from the brain metastases themselves. If whole brain radiation is recommended to you for your main treatment, you must obtain second opinions. If the reason WBR is recommended is because you aren’t a candidate for surgery or stereotactic radiosurgery, then it’s important to get second opinions to be sure that these other treatments really aren’t possible. On the positive side, a few members of the KIDNEY-ONC mailing list have reported tumor shrinkage and improvements in symptoms with WBR. In some cases it probably does have some benefit as a palliative treatment. For details on the evidence see the Whole Brain Radiation References.
  • As a Mop-Up Treatment After Surgery or Stereotactic Radiosurgery: The idea here is to kill tiny metastases which can’t yet be seen on scans. That sounds good but I can’t find any good evidence that WBR after surgery or stereotactic radiosurgery actually has benefit in kidney cancer. While the data aren’t from randomized studies, case series which looked at patients who had WBR versus those who didn’t found little suggestion that WBR was beneficial. This is no surprise since kidney cancer is relatively resistant to radiation. What is a surprise is how often doctors reach for WBR after surgery or radiosurgery “just to make sure” despite what seems to be a considerable lack of evidence. Keep in mind that surgery and especially stereotactic radiosurgery can be repeated in many cases in the event that new brain metastases do show up.


Whole Brain Radiation

DeAngelis LM, Delattre JY, Posner JB.
Radiation-induced dementia in patients cured of brain metastases
Neurology. 1989 Jun;39(6):789-96.[PubMed Abstract (will open in new window)]

Comment: Although these were not RCC patients, the side-effects of WBR on normal brain should be the same regardless of the type of cancer the patient has, therefore this is relevant.

Nieder C, Leicht A, Motaref B, Nestle U, Niewald M, Schnabel K.
Late radiation toxicity after whole brain radiotherapy: the influence of antiepileptic drugs.
Am J Clin Oncol. 1999 Dec;22(6):573-9. [PubMed Abstract (will open in new window)]

Comment: Although these were not RCC patients, the side-effects of WBR on normal brain should be the same regardless of the type of cancer the patient has, therefore this is relevant.

Nieder C, Niewald M, Schnabel K.
Treatment of brain metastases from hypernephroma.
Urol Int. 1996 ;57(1):17-20. [PubMed Abstract (will open in new window)]

Comment: This paper covers patients with all types of treatment and is fairly small. The majority got WBR alone, and it seemed to be ineffective. While patients who got surgery + WBR did the best, surgical patients may have fewer metastases and there is nothing here to say the WBR really contributed to that outcome.

Wronski M, Maor MH, Davis BJ, Sawaya R, Levin VA.
External radiation of brain metastases from renal carcinoma: a retrospective study of 119 patients from the M. D. Anderson Cancer Center.
Int J Radiat Oncol Biol Phys. 1997 Mar 1;37(4):753-9. [PubMed Abstract (will open in new window)]

Comment: This study is the primary reason I do not recommend whole brain radiation as primary treatment for brain metastasis from kidney cancer if any other option is available. Note the short survival and the high percentage of patients who died from their brain metastasis, rather than from other systemic disease. This shows how ineffective this treatment is for the vast majority of patients.

Stereotactic Radiosurgery

The general pattern here, a high rate of tumor control and a low rate of death due to brain metastasis is clear, so I don’t comment on each paper.

Amendola BE, Wolf AL, Coy SR, Amendola M, Bloch L.
Brain metastases in renal cell carcinoma: management with gamma knife radiosurgery.
Cancer J. 2000 Nov-Dec;6(6):372-6. [PubMed Abstract (will open in new window)]

Comment: This study pushes the frontier of how many brain metastases can be treated. Many centers limit treatment to a few brain metastases, but here they treated more than a dozen in some cases with success. If you are told you have "too many" to treat with radiosurgery I suggest finding a center which is willing to treat patients with more metastases. Consulting with the doctors who did this study is one avenue.

They were also able to retreat patients who developed new brain metastases - one patient was treated seven times.

Half the patients had already had whole brain radiation but this didn't affect the ability to get a great result with radiosurgery.

Becker G, Duffner F, Kortmann R, Weinmann M, Grote EH, Bamberg M.
Radiosurgery for the treatment of brain metastases in renal cell carcinoma.
Anticancer Res. 1999 Mar-Apr;19(2C):1611-7. [PubMed Abstract (will open in new window)]

Hernandez L, Zamorano L, Sloan A, Fontanesi J, Lo S, Levin K, Li Q, Diaz F.
Gamma knife radiosurgery for renal cell carcinoma brain metastases.
J Neurosurg. 2002 Dec;97(5 Suppl):489-93. [PubMed Abstract (will open in new window)]

Payne BR, Prasad D, Szeifert G, Steiner M, Steiner L.
Gamma surgery for intracranial metastases from renal cell carcinoma.
J Neurosurg. 2000 May;92(5):760-5. [PubMed Abstract (will open in new window)]

Whole Brain Radiation and Sterotactic Radiation Combined

It will be very clear looking at the abstracts that the pattern is that WBR adds nothing to SRS. These aren’t randomized studies, but then there is no randomized study showing WBR does add something either.

Goyal LK, Suh JH, Reddy CA, Barnett GH.
The role of whole brain radiotherapy and stereotactic radiosurgery on brain metastases from renal cell carcinoma.
Int J Radiat Oncol Biol Phys. 2000 Jul 1;47(4):1007-12. [PubMed Abstract (will open in new window)]

Schoggl A, Kitz K, Ertl A, Dieckmann K, Saringer W, Koos WT.
Gamma-knife radiosurgery for brain metastases of renal cell carcinoma: results in 23 patients.
Acta Neurochir (Wien). 1998 ;140(6):549-55. [PubMed Abstract (will open in new window)]

Mori Y, Kondziolka D, Flickinger JC, Logan T, Lunsford LD.
Stereotactic radiosurgery for brain metastasis from renal cell carcinoma.
Cancer. 1998 Jul 15;83(2):344-53. [PubMed Abstract (will open in new window)]

Sheehan JP, Sun MH, Kondziolka D, Flickinger J, Lunsford LD.
Radiosurgery in patients with renal cell carcinoma metastasis to the brain: long-term outcomes and prognostic factors influencing survival and local tumor control.
J Neurosurg. 2003 Feb;98(2):342-9. [PubMed Abstract (will open in new window)]

This CancerGuide Page By Steve Dunn. © Steve Dunn
Page Created: July 29, 2002, Last Updated: January 13, 2004