Spinal tumours associated with increased intracranial pressure. Report of two cases and a discussion on the pathophysiology.

Two cases of increased intracranial pressure associated with lumbar intraspinal tumours are reported. On the basis of protein investigations and constant flow infusion manometric tests, the pathophysiology of the increased intracranial pressure is discussed. It is demonstrated that protein macromolecules leak from the tumour into the cerebrospinal fluid and suggested that these are responsible for mechanical obstruction of the outflow channels for the cerebrospinal fluid.