| An
abnormal growth within the brain. These may be either benign
or malignant. The malignant tumors may start in the brain, or
may have spread from another part of the body. Common benign
tumors within the brain are meningiomas, acoustic neuromas, and pituitary
adenomas. The most common malignant tumor which starts in the
brain is an astrocytoma (which can be broken down into four grades
of aggressiveness). Tumors may also metastasize from other parts
of the body, such as lung, breast, colon, skin, etc. |
Glossary 
