They thought it was spinal fluid since there appeared to be no abrasion/cut/wound/etc that could have gotten infected and the fluid in the biopsy was mucusy (sp?) and had some blood.
The tests showed it wasn't that though.

The findings are posted in this thread a few pages back.

They are not sure what kind of "infection" it is but they do know from the sensitivity results that many common antibiotics would not be effective.

The surgery is to open his head and neck up and completely remove everything in there.