Tumor (Encyclopedia of Science)
A tumor is an abnormal growth of tissue. Also known as a neoplasm (meaning "new formation"), a tumor can be either benign (not serious or harmful) or malignant (cancerous or deadly). Either type may require therapy to remove it or reduce its size.
It is not known what triggers a tumor's abnormal growth. The body normally creates cells only at a rate needed to replace those that die or to aid an individual's growth and development. The growth of a tumor, however, is unregulated by normal body control mechanisms.
Benign and malignant tumors
A benign tumor is a well-defined growth with smooth boundaries that simply grows in diameter. This can be harmful if the tumor compresses the surrounding tissue against a hard surface in the body. A benign brain tumor that compresses brain tissue against the skull or the bony floor of the cranium can result in paralysis, loss of hearing or sight, dizziness, and other ailments. A tumor growing in the abdomen can compress the intestine and interfere with digestion. It also can prevent the proper functioning of the liver...
(The entire section is 604 words.)
Show us the love and view this for free! Use the facebook like button, or any other share button on this page, and get this content free!free!
Want to Read More?
Subscribe now to read the rest of this article. Plus get complete access to 30,000+ study guides!