懷念睿寶貝 Memory for Ray baby

轉移腦瘤
http://www.healthcentral.com/ency/408/000769.html#continue

Metastatic brain tumor
 
Definition:

A metastatic brain tumor is a mass of cancerous cells in the brain that have spread from another part of the body.

The term "metastatic" means it has spread. The original source of the cancer is called the primary tumor. Cells from the primary tumor have traveled in the bloodstream (metastasized) and lodged in the brain.

Alternative Names:
Brain tumor - metastatic (secondary); Cancer - brain tumor (metastatic)
Causes, incidence, and risk factors:

Many tumor or cancer types can spread to the brain, the most common being lung cancer, breast cancer, melanoma, kidney cancer, bladder cancer, certain sarcomas, testicular and germ cell tumors, and a number of others. Some types of cancers only spread to the brain infrequently, such as colon cancer, or very rarely, such as prostate cancer.

Brain tumors can directly destroy brain cells, or they may indirectly damage cells by producing inflammation, compressing other parts of the brain as the tumor grows, inducing brain swelling, and causing increased pressure within the skull.

Metastatic brain tumors are classified depending on the exact site of the tumor within the brain, type of tissue involved, original location of the tumor, and other factors. Infrequently, a tumor can spread to the brain, yet the original site or location of the tumor is unknown. This is called cancer of unknown primary (CUP) origin.

Metastatic brain tumors occur in about one-fourth of all cancers that metastasize (spread through the body). They are much more common than primary brain tumors. They occur in approximately 10-30% of adult cancers.