As I have been made to understand it, there is a clear equation, or proof, required for diagnosing a Superior Canal Dehiscence. The first step seems to be the hardest of them all:
You need 1 doctor who can put together the puzzle of your symptoms into a clearly assembled picture and send you for testing; or, you need to somehow put that puzzle together yourself and find the 1 doctor who understands this problem and will take a shot at investigating it. It’s still new, it’s very rare, but I don’t buy that the modern ENT worth his or her otoscope shouldn’t have heard about this disorder by now. Google lists hundreds of pages about SCDS. It was on The Doctors TV show, famous people have suffered from it and brought it into the news, and there are dozens of journal articles regarding the problem. And yet, it remains so “mysterious.”
If you manage to solve the first part of the equation and get a referral to a specialist, there are many tests that are performed on dizzy people. Dizziness is my primary symptom, and it is what leads to my other complaints of brain fog and fatigue. In some ways, people who have stronger audiology-related SCDS symptoms should be a tad bit easier to diagnose. Autophony and Tullio are very rare, and strongly indicate a dehiscence to a doctor who is current on the research in his/her field. There are many causes of dizziness, however, and most docs are under the inclination that “it’ll just go away over time.” If you’ve somehow passed through the first stage and found a SCDS-suspicious ally, you will need to have at least 2 tests. First, a hearing test. Most SCDS sufferers have some degree of low-frequency hearing loss. But again, lots of people have that symptom for a variety of reasons, so, in and of itself hearing loss cannot be the smoking gun. That gun is usually the VEMP TEST (Vestibular Evoked Myogenic Potential). If you have a strong VEMP response (which is perfectly comfortable, but very strange to endure), you are allowed to continue your progress to the final proof and solve for X.
It’s all well and good to have lots of symptoms, low-frequency hearing loss, and a strong VEMP, but they have to see the dehiscence in order to fully diagnose the problem. So, step 3 is a high-resolution, thinly-sliced CT of the temporal bone. It was strongly suggested to me that I have the images taken at the location of my doctor’s choosing because that facility is quite familiar with SCDS, understands how to get the best images, and would forward those images to a radiologist with experience diagnosing the disorder. Proof is in the picture. I understand that sometimes they can’t see it. Unfortunately, as I’ve been told, if they can’t see it, they don’t like to operate, so getting a great image and experienced radiologist are crucial in this final step.
And yet, even with a clear image and a reading from a trustworthy radiologist who has seen SCDS before, there can be wild differences of opinion. My radiologist called my dehiscence “slight.” Dr. Hain, the specialist who diagnosed me, thought I should opt for a more conservative approach and let my condition ride for a while longer, while Dr. Wiet, my surgeon, feels a 3mm hole is quite significant, and that my situation is clearly one in need of repair sooner than later. So, I then sought a second and now third opinion just to be sure.
With clear proof and X solved, there comes some relief — mentally. You know you’re not crazy, you’re validated in that someone believed you, and now you have a solid answer. But what you do with that answer is ultimately up to you, whose opinion you trust, and the degree to which you are suffering. I see that big X in front of me every day, and still debate what to do with it.