How can cancer cause compression of the spinal cord?

By growing on or . Cancer can affect the bones of the spine leading to deformity or a fracture compressing the spinal cord or the cancer can grow about the spinal cord and enlarge placing compression like a disc herniation or spinal stenosis or even grow fron within the spinal cord leading to compression effects.
See below. The spinal canal is canal encased by the bony vertebral column. There isn't a lot of extra room in there and the canal can't stretch or expand. If a tumor begins to occupy space within the canal then there's no room for what's supposed to be there, the spinal cord. , .