I am online and happy to help you with your question today.
this is not a usual thing after brain surgery. The fluid that is collecting is most likely cerebrospinal fluid (CSF).
I am sure that your wife's neurosurgeon has done, and is doing, everything possible to seal this leak.
Would you say that the fluid collection is less at this point then it was prior to the replacement of the mesh?
Is your wife having any symptoms, such as headache etc at this time?
I see that you are offline. I'll switch over to the Q&A system. This system works a lot like 'text messaging' but an email is sent to each of us anytime something is posted to this thread. We can continue to work on your question there..... :)