Which of the following is false regarding neoplastic compressive myelopathy?

Any malignant tumour can metastasise to spinal columns, paicularly tumours of breast, lung, prostate, kidney, lymphoma and myeloma. The most common site is the thoracic spinal column. Most neoplasms are epidural in origin, resulting from metastases to adjacent veebral body. Unlike infections of the spinal column, the tumours do not cross the disk space. Reference: Harrison's Principles of Internal Medicine, 21st edition, p2653