Cerebrospinal Fluid leaking from nose

The jurists have stated that if any fluid emerges from the nose, ears, breasts etc. not due to pain, then the fluid will not be considered as impure, hence the Wudhu will remain intact. However, if the fluid emerges due to pain, then it be considered impure, and Wudhu will be nullified. The pain experienced indicates that the fluid is emerging from a wound which would nullify the Wudhu. Now in the queried scenario, the fluid that is emerging from around the brain is most probably emerging from a wound (after surgery), hence Wudhu should be renewed as a precautionary measure.