It began about a month after my AN surgery. Leak from the incision site, clear to a bloody discharge. Then it would heal for awhile, then a surgical screw came out of the site. They removed my cranial plate, and found a low grade bone infection. So I was on a picc line for 8 weeks. It cleared up again, until I took a plane flight. I had massive pain behind my eye, then discharge again from the incision site, and yes fullness in the ear. I had a revision of the incision again, and again leaked about 5 months after. My former Neurosurgeon refused to believe it was a CSF, given the time, and that he said he checked the area. I went back to Barrows where my original surgery had taken place. I met my new Surgeon, who after looking at a multitude of MRI and CTs said it was a CSF. My CSF was filling my mastoid, given that at times my body would heal the area, he placed the LP shunt in hopes that it would relive the pressure enough for my body to heal it for good. I cant really say that fullness is a sign of CSF or just the AN surgery. I'M just praying very hard that this is going to correct it, if not, the next step is mastoid obliteration, which I would prefer to avoid. I have a MRI on wed to check the area, hope my story helps.