ventricular puncture is a form of lumbar puncture where the insertion point is made higher up the spine than usual.  It is a very rare procedure and is usually only considered when a regular lumbar puncture may result in brain herniation.  It poses a higher risk of spinal cord damage and resulting paralysis.

In Distractions the team had to perform a ventricular puncture on Adam because the lack of skin at the usual entry point on the spinal column posed too high a risk of infection of the cerebro-spinal fluid.

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