Last Modified: 06/15/2010
General Information About Intraocular (Eye) Melanoma
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Stages of Intraocular (Eye) Melanoma
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Recurrent Intraocular (Eye) Melanoma
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Treatment Option Overview
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Treatment Options for Intraocular (Eye) Melanoma
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To Learn More About Intraocular (Eye) Melanoma
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Changes to This Summary (06/15/2010)
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Get More Information From NCI
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About PDQ
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General Information About Intraocular (Eye) Melanoma
Intraocular melanoma is a disease in which malignant (cancer) cells form in the tissues of the eye.
Intraocular melanoma begins in the middle of 3 layers of the wall of the eye. The outer layer includes the white sclera (the "white of the eye") and the clear cornea at the front of the eye. The inner layer has a lining of nerve tissue, called the retina, which senses light and sends images along the optic nerve to the brain.
The middle layer, where intraocular melanoma forms, is called the uvea or uveal tract, and has 3 main parts:
- Iris
The iris is the colored area at the front of the eye (the "eye color"). It can be seen through the clear cornea. The pupil is in the center of the iris and it changes size to let more or less light into the eye.
- Ciliary body
The ciliary body is a ring of tissue with muscle fibers that change the size of the pupil and the shape of the lens. It is found behind the iris. Changes in the shape of the lens help the eye focus. The ciliary body also makes the clear fluid that fills the space between the cornea and the iris.
- Choroid
The choroid is the layer of blood vessels that bring oxygen and nutrients to the eye. Most intraocular melanomas begin in the choroid.
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Intraocular melanoma is a rare cancer, but it is the most common eye cancer in adults.
Age and sun exposure may increase the risk of developing intraocular melanoma.
Anything that increases your risk of getting a disease is called a risk factor. Having a risk factor does not mean that you will get cancer; not having risk factors doesn’t mean that you will not get cancer. People who think they may be at risk should discuss this with their doctor. Risk factors for intraocular melanoma include the following:
- Being exposed to natural sunlight or artificial sunlight (such as from tanning beds) over long periods of time.
- Having a fair complexion, which includes the following:
- Fair skin that freckles and burns easily, does not tan, or tans poorly.
- Blue or green or other light-colored eyes.
- Older age.
- Being white.
Possible signs of intraocular melanoma include a dark spot on the iris or blurred vision.
Intraocular melanoma may not cause any early symptoms. It is sometimes found during a routine eye exam when the doctor dilates the pupil and looks into the eye. The following symptoms may be caused by intraocular melanoma or by other conditions. A doctor should be consulted if any of these problems occur:
- A dark spot on the iris.
- Blurred vision.
- A change in the shape of the pupil.
- A change in vision.
Glaucoma may develop if the tumor causes the retina to separate from the eye. If this happens, there may be no symptoms, or symptoms may include the following:
- Eye pain.
- Blurred vision.
- Eye redness.
- Nausea.
Tests that examine the eye are used to help detect (find) and diagnose intraocular melanoma.
The following tests and procedures may be used:
- Eye exam with dilated pupil: An examination of the eye in which the pupil is dilated (enlarged) with medicated eyedrops to allow the doctor to look through the lens and pupil to the retina. The inside of the eye, including the retina and the optic nerve, is examined using an instrument that produces a narrow beam of light. This is sometimes called a slit-lamp exam. The doctor may take pictures over time to keep track of changes in the size of the tumor and how fast it is growing.
- Indirect ophthalmoscopy: An examination of the inside of the back of the eye using a small magnifying lens and a light.
- Ultrasound exam of the eye: A procedure in which high-energy sound waves (ultrasound) are bounced off the internal tissues of the eye to make echoes. Eye drops are used to numb the eye and a small probe that sends and receives sound waves is placed gently on the surface of the eye. The echoes make a picture of the inside of the eye. The picture, called a sonogram, shows on the screen of the ultrasound monitor.
- Transillumination of the globe and iris: An examination of the iris, cornea, lens, and ciliary body with a light placed on either the upper or lower lid.
- Fluorescein angiography: A procedure to look at blood vessels and the flow of blood inside the eye. An orange fluorescent dye (fluorescein) is injected into a blood vessel in the arm. As the dye travels through blood vessels of the eye, a special camera takes pictures of the retina and choroid to detect any blockage or leakage.
Certain factors affect prognosis (chance of recovery) and treatment options.
The prognosis (chance of recovery) and treatment options depend on the following:
- The type of melanoma cells (how they look under a microscope).
- The size of the tumor.
- Which part of the eye the tumor is in (the iris, ciliary body, or choroid).
- Whether the tumor has spread within the eye or to other places in the body.
- The patient's age and general health.
- Whether the tumor has recurred (come back) after treatment.
In patients with small tumors that have not spread, intraocular melanoma can be cured and vision can usually be saved.
Stages of Intraocular (Eye) Melanoma
After intraocular melanoma has been diagnosed, tests are done to find out if cancer cells have spread within the eye or to other parts of the body.
The process used to find out if cancer has spread within the eye or to other parts of the body is called staging. The information gathered from the staging process determines the stage of the disease. It is important to know the stage in order to plan treatment. The following tests and procedures may be used in the staging process:
- Gonioscopy: An examination of the front part of the eye between the cornea and iris. A special instrument is used to check for blockages in the area where fluid drains out of the eye.
- Ultrasound biomicroscopy: A procedure that uses high-energy sound waves to measure small tumors. The amount of detail is about the same as that of a low-power microscope. Tumors can be examined this way for shape, thickness, and signs that they have spread to nearby tissue.
- Blood chemistry studies: A procedure in which a blood sample is checked to measure the amounts of certain substances released into the blood by organs and tissues in the body. An unusual (higher or lower than normal) amount of a substance can be a sign of disease in the organ or tissue that makes it.
- Liver function tests: A procedure in which a blood sample is checked to measure the amounts of certain substances released into the blood by the liver. A higher than normal amount of a substance can be a sign the cancer has spread to the liver.
- Ultrasound exam: A procedure in which high-energy sound waves (ultrasound) are bounced off internal tissues or organs, such as the liver, and make echoes. The echoes form a picture of body tissues called a sonogram.
- Chest x-ray: An x-ray of the organs and bones inside the chest. An x-ray is a type of energy beam that can go through the body and onto film, making a picture of areas inside the body.
- CT scan (CAT scan): A procedure that makes a series of detailed pictures of areas inside the body, such as the liver or brain, taken from different angles. The pictures are made by a computer linked to an x-ray machine. A dye may be injected into a vein or swallowed to help the organs or tissues show up more clearly. This procedure is also called computed tomography, computerized tomography, or computerized axial tomography.
Sometimes pictures of the tumor are taken over a period of time and compared to see if the tumor has grown.
The following sizes are used to describe intraocular melanoma:
The tumor is at least 5 millimeters in diameter and from 1 to 3 millimeters thick.
The tumor is less than 16 millimeters in diameter and from 2 to 10 millimeters thick.
The tumor is at least 16 millimeters in diameter or more than 10 millimeters thick.
The tumor is flat and grows widely across the uvea.
There are three ways that cancer spreads in the body.
The three ways that cancer spreads in the body are:
- Through tissue. Cancer invades the surrounding normal tissue.
- Through the lymph system. Cancer invades the lymph system and travels through the lymph vessels to other places in the body.
- Through the blood. Cancer invades the veins and capillaries and travels through the blood to other places in the body.
When cancer cells break away from the primary (original) tumor and travel through the lymph or blood to other places in the body, another (secondary) tumor may form. This process is called metastasis. The secondary (metastatic) tumor is the same type of cancer as the primary tumor. For example, if breast cancer spreads to the bones, the cancer cells in the bones are actually breast cancer cells. The disease is metastatic breast cancer, not bone cancer.
Intraocular melanoma may spread to nearby tissues or to other parts of the body.
If intraocular melanoma spreads to the optic nerve or nearby tissue of the eye socket, it is called extraocular extension. Intraocular melanoma may also be metastatic and spread to the liver, lung, or bone, or to areas under the skin.
Recurrent Intraocular (Eye) Melanoma
Recurrent intraocular melanoma is cancer that has recurred (come back) after it has been treated. The melanoma may come back in the eye, or in other parts of the body.
Treatment Option Overview
There are different types of treatments for patients with intraocular melanoma.
Different types of treatments are available for patients with intraocular melanoma. Some treatments are standard (the currently used treatment), and some are being tested in clinical trials. A treatment clinical trial is a research study meant to help improve current treatments or obtain information on new treatments for patients with cancer. When clinical trials show that a new treatment is better than the standard treatment, the new treatment may become the standard treatment. Patients may want to think about taking part in a clinical trial. Some clinical trials are open only to patients who have not started treatment.
Five types of standard treatment are used:
Surgery is the most common treatment for intraocular melanoma. The following types of surgery may be used:
- Local tumor resection: Surgery to remove the tumor and a small amount of healthy tissue around it.
- Enucleation: Surgery to remove the eye and part of the optic nerve. This is done if the tumor is large and vision cannot be saved. The patient may be fitted for an artificial eye after enucleation.
- Exenteration: Surgery to remove the eye and eyelid, and muscles, nerves, and fat in the eye socket. The patient may be fitted for an artificial eye or facial prosthesis after exenteration.
Watchful waiting is closely monitoring a patient’s condition without giving any treatment until symptoms appear or change. A series of pictures is taken over time to keep track of changes in the size of the tumor and how fast it is growing.
Radiation therapy is a cancer treatment that uses high-energy x-rays or other types of radiation to kill cancer cells or keep them from growing. There are two types of radiation therapy. External radiation therapy uses a machine outside the body to send radiation toward the cancer. Internal radiation therapy uses a radioactive substance sealed in needles, seeds, wires, or catheters that are placed directly into or near the cancer. The way the radiation therapy is given depends on the type and stage of the cancer being treated.
Localized plaque radiation therapy is a type of internal radiation therapy that may be used for tumors of the eye. Radioactive seeds are attached to a disk, called a plaque, and placed directly on the wall of the eye where the tumor is located. The side with the seeds faces the eyeball and delivers radiation to the eye. The plaque, which is often made of gold, helps protect nearby tissues from radiation damage.
Charged-particle radiation therapy is a type of external radiation therapy. A special radiation therapy machine aims tiny, invisible particles, called protons or helium ions, at the cancer cells to kill them with little damage to nearby normal tissues. Charged-particle radiation therapy uses a different type of radiation than the x-ray type of radiation therapy.
Gamma Knife radiosurgery may be used for some melanomas. This non-surgical treatment aims tightly focused gamma rays directly at the tumor so there is little damage to healthy tissue. Gamma Knife is a type of stereotactic radiosurgery.
Photocoagulation is a procedure that uses laser light to destroy blood vessels that supply nutrients to the tumor, causing the tumor cells to die. Photocoagulation may be used to treat small tumors. This is also called light coagulation.
Thermotherapy is the use of heat to destroy cancer cells. Thermotherapy may be given using:
- A laser beam aimed through the dilated pupil or onto the outside of the eyeball.
- Ultrasound.
- Microwaves.
- Infrared radiation (light that cannot be seen but can be felt as heat).
New types of treatment are being tested in clinical trials.
Information about clinical trials is available from the NCI Web site 2.
Patients may want to think about taking part in a clinical trial.
For some patients, taking part in a clinical trial may be the best treatment choice. Clinical trials are part of the cancer research process. Clinical trials are done to find out if new cancer treatments are safe and effective or better than the standard treatment.
Many of today's standard treatments for cancer are based on earlier clinical trials. Patients who take part in a clinical trial may receive the standard treatment or be among the first to receive a new treatment.
Patients who take part in clinical trials also help improve the way cancer will be treated in the future. Even when clinical trials do not lead to effective new treatments, they often answer important questions and help move research forward.
Patients can enter clinical trials before, during, or after starting their cancer treatment.
Some clinical trials only include patients who have not yet received treatment. Other trials test treatments for patients whose cancer has not gotten better. There are also clinical trials that test new ways to stop cancer from recurring (coming back) or reduce the side effects of cancer treatment.
Clinical trials are taking place in many parts of the country. See the Treatment Options section that follows for links to current treatment clinical trials. These have been retrieved from NCI's listing of clinical trials.
Follow-up tests may be needed.
Some of the tests that were done to diagnose the cancer or to find out the stage of the cancer may be repeated. Some tests will be repeated in order to see how well the treatment is working. Decisions about whether to continue, change, or stop treatment may be based on the results of these tests. This is sometimes called re-staging.
Some of the tests will continue to be done from time to time after treatment has ended. The results of these tests can show if your condition has changed or if the cancer has recurred (come back). These tests are sometimes called follow-up tests or check-ups.
Treatment Options for Intraocular (Eye) Melanoma
A link to a list of current clinical trials is included for each treatment section. For some types or stages of cancer, there may not be any trials listed. Check with your doctor for clinical trials that are not listed here but may be right for you.
Iris MelanomaTreatment of iris melanoma may include the following:
Check for U.S. clinical trials from NCI's list of cancer clinical trials that are now accepting patients with iris melanoma 3. For more specific results, refine the search by using other search features, such as the location of the trial, the type of treatment, or the name of the drug. General information about clinical trials is available from the NCI Web site 4.
Ciliary Body MelanomaTreatment of tumors in the ciliary body and choroid may include the following:
- Plaque radiation therapy.
- Charged-particle external radiation therapy.
- Surgery (local tumor resection or enucleation).
Check for U.S. clinical trials from NCI's list of cancer clinical trials that are now accepting patients with ciliary body and choroid melanoma, small size 5. For more specific results, refine the search by using other search features, such as the location of the trial, the type of treatment, or the name of the drug. General information about clinical trials is available from the NCI Web site 4.
Small Choroid MelanomaTreatment of small choroid melanoma may include the following:
- Watchful waiting.
- Plaque radiation therapy.
- Charged-particle external radiation therapy.
- Gamma Knife radiation surgery.
- Photocoagulation.
- Thermotherapy.
- Surgery (local tumor resection or enucleation).
Check for U.S. clinical trials from NCI's list of cancer clinical trials that are now accepting patients with ciliary body and choroid melanoma, small size 5. For more specific results, refine the search by using other search features, such as the location of the trial, the type of treatment, or the name of the drug. General information about clinical trials is available from the NCI Web site 4.
Medium and Large Choroid MelanomaTreatment of medium choroid melanoma may include the following:
- Plaque radiation therapy.
- Plaque radiation therapy with photocoagulation or thermotherapy.
- Charged-particle external radiation therapy.
- Surgery (local tumor resection or enucleation).
Treatment of large choroid melanoma may include surgery (enucleation) with or without radiation therapy before surgery.
Check for U.S. clinical trials from NCI's list of cancer clinical trials that are now accepting patients with ciliary body and choroid melanoma, medium/large size 6. For more specific results, refine the search by using other search features, such as the location of the trial, the type of treatment, or the name of the drug. General information about clinical trials is available from the NCI Web site 4.
Extraocular Extension Melanoma and Metastatic Intraocular (Eye) MelanomaTreatment of extraocular extension melanoma or metastatic melanoma may include surgery (exenteration) with or without radiation therapy.
Check for U.S. clinical trials from NCI's list of cancer clinical trials that are now accepting patients with extraocular extension melanoma 7 and metastatic intraocular melanoma 8. For more specific results, refine the search by using other search features, such as the location of the trial, the type of treatment, or the name of the drug. General information about clinical trials is available from the NCI Web site 4.
Recurrent Intraocular (Eye) MelanomaTreatment of recurrent intraocular melanoma is usually within a clinical trial.
Check for U.S. clinical trials from NCI's list of cancer clinical trials that are now accepting patients with recurrent intraocular melanoma 9. For more specific results, refine the search by using other search features, such as the location of the trial, the type of treatment, or the name of the drug. General information about clinical trials is available from the NCI Web site 4.
To Learn More About Intraocular (Eye) Melanoma
For more information from the National Cancer Institute about intraocular (eye) melanoma, see the Melanoma Home Page 10.
For general cancer information and other resources from the National Cancer Institute, see the following:
- What You Need to Know About™ Cancer 11
- Understanding Cancer Series: Cancer 12
- Cancer Staging 13
- Chemotherapy and You: Support for People With Cancer 14
- Radiation Therapy and You: Support for People With Cancer 15
- Coping with Cancer: Supportive and Palliative Care 16
- Questions to Ask Your Doctor About Cancer 17
- Cancer Library 18
- Information For Survivors/Caregivers/Advocates 19
Changes to This Summary (06/15/2010)
The PDQ cancer information summaries are reviewed regularly and updated as new information becomes available. This section describes the latest changes made to this summary as of the date above.
Editorial changes were made to this summary.
Get More Information From NCI
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About PDQ
PDQ is a comprehensive cancer database available on NCI's Web site.
PDQ is the National Cancer Institute's (NCI's) comprehensive cancer information database. Most of the information contained in PDQ is available online at NCI's Web site 21. PDQ is provided as a service of the NCI. The NCI is part of the National Institutes of Health, the federal government's focal point for biomedical research.
PDQ contains cancer information summaries.
The PDQ database contains summaries of the latest published information on cancer prevention, detection, genetics, treatment, supportive care, and complementary and alternative medicine. Most summaries are available in two versions. The health professional versions provide detailed information written in technical language. The patient versions are written in easy-to-understand, nontechnical language. Both versions provide current and accurate cancer information.
The PDQ cancer information summaries are developed by cancer experts and reviewed regularly.
Editorial Boards made up of experts in oncology and related specialties are responsible for writing and maintaining the cancer information summaries. The summaries are reviewed regularly and changes are made as new information becomes available. The date on each summary ("Date Last Modified") indicates the time of the most recent change.
PDQ also contains information on clinical trials.
A clinical trial is a study to answer a scientific question, such as whether one treatment is better than another. Trials are based on past studies and what has been learned in the laboratory. Each trial answers certain scientific questions in order to find new and better ways to help cancer patients. During treatment clinical trials, information is collected about the effects of a new treatment and how well it works. If a clinical trial shows that a new treatment is better than one currently being used, the new treatment may become "standard." Patients may want to think about taking part in a clinical trial. Some clinical trials are open only to patients who have not started treatment.
Listings of clinical trials are included in PDQ and are available online at NCI's Web site 4. Descriptions of the trials are available in health professional and patient versions. Many cancer doctors who take part in clinical trials are also listed in PDQ. For more information, call the Cancer Information Service 1-800-4-CANCER (1-800-422-6237).
Glossary Termsangiography (an-jee-AH-gruh-fee)A procedure to x-ray blood vessels. The blood vessels can be seen because of an injection of a dye that shows up in the x-ray.blood (blud) A tissue with red blood cells, white blood cells, platelets, and other substances suspended in fluid called plasma. Blood takes oxygen and nutrients to the tissues, and carries away wastes.blood vessel (blud VEH-sel) A tube through which the blood circulates in the body. Blood vessels include a network of arteries, arterioles, capillaries, venules, and veins.cancer (KAN-ser) A term for diseases in which abnormal cells divide without control and can invade nearby tissues. Cancer cells can also spread to other parts of the body through the blood and lymph systems. There are several main types of cancer. Carcinoma is a cancer that begins in the skin or in tissues that line or cover internal organs. Sarcoma is a cancer that begins in bone, cartilage, fat, muscle, blood vessels, or other connective or supportive tissue. Leukemia is a cancer that starts in blood-forming tissue such as the bone marrow, and causes large numbers of abnormal blood cells to be produced and enter the blood. Lymphoma and multiple myeloma are cancers that begin in the cells of the immune system. Central nervous system cancers are cancers that begin in the tissues of the brain and spinal cord. Also called malignancy.cell (sel) The individual unit that makes up the tissues of the body. All living things are made up of one or more cells.choroid (KOR-oyd) A thin layer of tissue that is part of the middle layer of the wall of the eye, between the sclera (white outer layer of the eye) and the retina (the inner layer of nerve tissue at the back of the eye). The choriod is filled with blood vessels that bring oxygen and nutrients to the eye.ciliary body (SIH-lee-ayr-ee ...) A part of the middle layer of the wall of the eye. The ciliary body includes the ring-shaped muscle that changes the size of the pupil and the shape of the lens when the eye focuses. It also makes the fluid that fills the eye.clinical trial (KLIH-nih-kul TRY-ul) A type of research study that tests how well new medical approaches work in people. These studies test new methods of screening, prevention, diagnosis, or treatment of a disease. Also called clinical study.contrast material (KON-trast muh-TEER-ee-ul) A dye or other substance that helps show abnormal areas inside the body. It is given by injection into a vein, by enema, or by mouth. Contrast material may be used with x-rays, CT scans, MRI, or other imaging tests.cornea (KOR-nee-uh) The transparent part of the eye that covers the iris and the pupil and allows light to enter the inside.cure (kyoor) To heal or restore health; a treatment to restore health.dilate (DY-layt) To widen or enlarge an opening or hollow structure beyond its usual size, such as the pupil of the eye or a blood vessel.eye cancer (i KAN-ser) Cancer that forms in tissues of and around the eye. Some of the cancers that may affect the eye include melanoma (a rare cancer that begins in cells that make the pigment melanin in the eye), carcinoma (cancer that begins in tissues that cover structures in the eye), lymphoma (cancer that begins in immune system cells), and retinoblastoma (cancer that begins in the retina and usually occurs in children younger than 5 years).fluid (FLOO-id) A substance that flows smoothly and takes the shape of its container. Liquids and gases are fluids.injection (in-JEK-shun) Use of a syringe and needle to push fluids or drugs into the body; often called a "shot."intraocular melanoma (IN-truh-AH-kyoo-ler MEH-luh-NOH-muh) A rare cancer of melanocytes (cells that produce the pigment melanin) found in the eye. Also called ocular melanoma.iris (I-ris) The colored tissue at the front of the eye that contains the pupil in the center. The iris helps control the size of the pupil to let more or less light into the eye.lens (lenz) A clear disk that focuses light, as in a camera or microscope. In the eye, the lens is a clear, curved structure at the front of the eye behind the pupil. It focuses light rays that enter the eye through the pupil, making an image on the retina (light-sensitive layers of nerve tissue at the back of the eye).monitor (MAH-nih-ter) In medicine, to regularly watch and check a person or condition to see if there is any change. Also refers to a device that records and/or displays patient data, such as for an electrocardiogram (EKG).nausea (NAW-zee-uh) A feeling of sickness or discomfort in the stomach that may come with an urge to vomit. Nausea is a side effect of some types of cancer therapy.nerve (nerv) A bundle of fibers that receives and sends messages between the body and the brain. The messages are sent by chemical and electrical changes in the cells that make up the nerves.nutrient (NOO-tree-ent) A chemical compound (such as protein, fat, carbohydrate, vitamin, or mineral) contained in foods. These compounds are used by the body to function and grow.ophthalmoscope (of-THAL-moh-skope) A lighted instrument used to examine the inside of the eye, including the retina and the optic nerve.optic nerve (OP-tik nerv) The nerve that carries messages from the retina to the brain.oxygen (OK-sih-jen) A colorless, odorless gas. It is needed for animal and plant life. Oxygen that is breathed in enters the blood from the lungs and travels to the tissues.PDQ PDQ is an online database developed and maintained by the National Cancer Institute. Designed to make the most current, credible, and accurate cancer information available to health professionals and the public, PDQ contains peer-reviewed summaries on cancer treatment, screening, prevention, genetics, complementary and alternative medicine, and supportive care; a registry of cancer clinical trials from around the world; and directories of physicians, professionals who provide genetics services, and organizations that provide cancer care. Most of this information, and more specific information about PDQ, can be found on the NCI's Web site at http://www.cancer.gov/cancertopics/pdq. Also called Physician Data Query.prognosis (prog-NO-sis) The likely outcome or course of a disease; the chance of recovery or recurrence.pupil (PYOO-pul) The round opening in the center of the iris (the colored tissue that makes the "eye color" at the front of the eye). The pupil changes size to let light into the eye. It gets smaller in bright light and larger as the amount of light decreases.recur (ree-KER) To come back or to return.recurrent cancer (ree-KER-ent KAN-ser) Cancer that has recurred (come back), usually after a period of time during which the cancer could not be detected. The cancer may come back to the same place as the original (primary) tumor or to another place in the body. Also called recurrence.retina (REH-tih-nuh) The light-sensitive layers of nerve tissue at the back of the eye that receive images and sends them as electric signals through the optic nerve to the brain.risk factor (... FAK-ter) Something that increases the chance of developing a disease. Some examples of risk factors for cancer are age, a family history of certain cancers, use of tobacco products, being exposed to radiation or certain chemicals, infection with certain viruses or bacteria, and certain genetic changes.sclera (SKLAYR-uh) The white layer of the eye that covers most of the outside of the eyeball.sonogram (SAH-noh-gram) A computer picture of areas inside the body created by bouncing high-energy sound waves (ultrasound) off internal tissues or organs. Also called ultrasonogram.stage (stayj) The extent of a cancer in the body. Staging is usually based on the size of the tumor, whether lymph nodes contain cancer, and whether the cancer has spread from the original site to other parts of the body.symptom (SIMP-tum) An indication that a person has a condition or disease. Some examples of symptoms are headache, fever, fatigue, nausea, vomiting, and pain.tissue (TIH-shoo) A group or layer of cells that work together to perform a specific function.tumor (TOO-mer) An abnormal mass of tissue that results when cells divide more than they should or do not die when they should. Tumors may be benign (not cancer), or malignant (cancer). Also called neoplasm.ultrasound (UL-truh-SOWND) A procedure in which high-energy sound waves are bounced off internal tissues or organs and make echoes. The echo patterns are shown on the screen of an ultrasound machine, forming a picture of body tissues called a sonogram. Also called ultrasonography.uvea (YOO-vee-uh) The middle layer of the wall of the eye. The uvea has 3 main parts: (1) the choroid (the tissue layer filled with blood vessels); (2) the ciliary body (the ring of muscle tissue that changes the size of the pupil and the shape of the lens); and (3) the iris (the colored part of the eye). Also called uveal tract. |