Why intracranial hypertension patient can not lumbar puncture needle

If the increased intracranial pressure is caused by the high pressure of the brain tissue itself, the brain tissue is easy to slip through the gap as long as there is a gap, especially when the pressure in the gap becomes low. In clinical practice, some patients with extremely high pressure after surgery (almost all of them have severe and untreatable craniocerebral injury), Brain tissue will force its way through a sutured surgical incision!

However, if the increased intracranial pressure is caused by excessive cerebrospinal fluid, lumbar puncture itself cannot increase the risk of cerebral hernia, but at this time, it is usually easy to lead to excessive fluid discharge, which can also lead to cerebral hernia. So severe intracranial pressure is contraindicated for lumbar puncture, especially in patients with posterior fossa mass.