Definition of Spinal tumor:

A spinal tumor is a growth of cells (mass) in or surrounding the spinal cord.

Causes, incidence, and risk factors:

Any type of tumor may occur in the spine, including:

• Leukemia
• Lymphoma
• Myeloma

A small number of spinal tumors occur in the nerves of the spinal cord itself. Most often these are ependymomas and other gliomas.

Tumors that start in spinal tissue are called primary spinal tumors. Tumors that spread to the spine from some other place (metatastasis) are called secondary spinal tumors.

The cause of primary spinal tumors is unknown. Some primary spinal tumors occur with genetic defects. A spinal tumor is much less common than a primary brain tumor.

Spinal tumors can occur:

• Inside the cord (intramedullary)
• In the membranes (meninges) covering the spinal cord (extramedullary - intradural)
• Between the meninges and bones of the spine (extradural)

Or, tumors may extend from other locations. Most spinal tumors are extradural.

As it grows, the tumor can affect the:

• Blood vessels
• Bones of the spine
• Meninges
• Nerve roots
• Spinal cord cells

It may press on (compress) the spinal cord or nerve roots (similar to spinal cord trauma), invade normal cells, or block blood vessels and lead to a lack of oxygen (ischemia).