I'm surprised that this condition hasn't come up for discussion on this forum more often than it has. I did some looking through the old forum archives and found the last real discussion of it was back in 2009. I bring it up because I had Meniere's (largely fixed by way of a laby 3 years ago), but have been recently diagnosed with Chiari Malformation. What's interesting to me is, having now experienced both, how similar many of the symptoms are. With Chiari, the most common symptom is headache, but, from Timothy Hain's website: "A recent review of the otologic manifestations of Chiari in 16 patients indicated that 81% reported episodic aural fullness, 81% tinnitus, 69% vertigo, and 56% flutuating hearing." This theme of ear-related symptoms crops up over and over in the Chiari literature. I don't have any further vertigo or hearing loss, but definitely have the aural fullness and increased tinnitus from Chiari. What's really strange is it manifests itself mainly in my laby ear. The ear pressure feels exactly like I experienced with Meniere's. There also appears to be a consensus that there is a significant correlation between Chiari and chronic migraine (which I also have). In no way am I implying there's a connection between Chiari Malformation and Meniere's. But....I know there's a lot of people on this forum dealing with MAV, or perhaps a combination of Meniere's and MAV. I'm just saying - have your MRI's rechecked (Chiari often is overlooked by radiologists who read them). And for those that are thinking, "ok, but what is Chiari Malformation"? It's a condition where a small portion of the cerebellum is displaced through the foramen magnum (opening at the bottom of the skull) into the spinal canal. This is a bad thing because it interferes with, or stops CSF flow to and from the brain. In my case, the malformation was recognized years ago but like many people, I was probably largely asymptomatic. A few months ago I had some lower back surgery and developed a post-op CSF leak. It seems this kicked my Chiari symptoms into gear. This is apparently quite common.