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).
(http://www.cancer.gov/dictionary)
(http://www.cancer.gov/dictionary)
(http://www.cancer.gov/dictionary)
(http://www.cancer.gov/dictionary)
(http://www.cancer.gov/dictionary)
(http://www.cancer.gov/dictionary)
(http://www.cancer.gov/dictionary)
(http://www.cancer.gov/dictionary)
(http://www.cancer.gov/dictionary)
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.
Source: The National Cancer Institute's Dictionary of Cancer Terms(http://www.cancer.gov/dictionary)
carcinoma (KAR-sih-NOH-muh)
Cancer that begins in the skin or in tissues that line or cover internal organs.
Source: The National Cancer Institute's Dictionary of Cancer Terms(http://www.cancer.gov/dictionary)
immune system (ih-MYOON SIS-tem)
The complex group of organs and cells that defends the body against infections and other diseases.
Source: The National Cancer Institute's Dictionary of Cancer Terms(http://www.cancer.gov/dictionary)
lymphoma (lim-FOH-muh)
Cancer that begins in cells of the immune system. There are two basic categories of lymphomas. One kind is Hodgkin lymphoma, which is marked by the presence of a type of cell called the Reed-Sternberg cell. The other category is non-Hodgkin lymphomas, which includes a large, diverse group of cancers of immune system cells. Non-Hodgkin lymphomas can be further divided into cancers that have an indolent (slow-growing) course and those that have an aggressive (fast-growing) course. These subtypes behave and respond to treatment differently. Both Hodgkin and non-Hodgkin lymphomas can occur in children and adults, and prognosis and treatment depend on the stage and the type of cancer.
Source: The National Cancer Institute's Dictionary of Cancer Terms(http://www.cancer.gov/dictionary)
melanin (MEH-luh-nin)
A pigment that gives color to skin and eyes and helps protect it from damage by ultraviolet light.
Source: The National Cancer Institute's Dictionary of Cancer Terms(http://www.cancer.gov/dictionary)
melanoma (MEH-luh-NOH-muh)
A form of cancer that begins in melanocytes (cells that make the pigment melanin). It may begin in a mole (skin melanoma), but can also begin in other pigmented tissues, such as in the eye or in the intestines.
Source: The National Cancer Institute's Dictionary of Cancer Terms(http://www.cancer.gov/dictionary)
pigment (PIG-ment)
A substance that gives color to tissue. Pigments are responsible for the color of skin, eyes, and hair.
Source: The National Cancer Institute's Dictionary of Cancer Terms(http://www.cancer.gov/dictionary)
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.
Source: The National Cancer Institute's Dictionary of Cancer Terms(http://www.cancer.gov/dictionary)
retinoblastoma (REH-tih-noh-blas-TOH-muh)
Cancer that forms in the tissues of the retina (the light-sensitive layers of nerve tissue at the back of the eye). Retinoblastoma usually occurs in children younger than 5 years. It may be hereditary or nonhereditary (sporadic).
Source: The National Cancer Institute's Dictionary of Cancer Terms(http://www.cancer.gov/dictionary)
Source: The National Cancer Institute's Dictionary of Cancer Terms
(http://www.cancer.gov/dictionary)
(http://www.cancer.gov/dictionary)
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