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Spinal cord compression. II.

There are three localized infections which may give rise to paraplegia. Tuberculosis caries of the spine (Potts paraplegia)-The cord compression is usually due to the presence of tuberculous granulation tissue within the spinal canal. Vertebral collapse (often involving two adjacent vertebral bodies and the intervertebral disc) is usually present, though the wedging of the vertebrae is not thought to be the prime cause of the paraplegia. A paravertebral abscess is also often present, and because it is in continuity with the spinal canal through an intervertebral foramen may, if tense, contribute to the cord compression. Occasionally bony or cartilaginous sequestra may also compress the cord. Pott's paraplegia is generally slow in onset and is associated with progressive activity of the disease when this has been untreated or inadequately treated. It usually arises during the early weeks or months of the disorder. Paraplegia of sudden onset in the presence of tuberculous caries is -generally due to infarction of the cord.