Membranous or Hypermobile Stapes Footplate: A New Anatomic Site Resulting in Third Window Syndrome.

To describe a potentially underappreciated pathology for post-traumatic persistent intractable dizziness and third window syndrome as well as the methods to diagnose and surgically manage this disorder. Observational analytic case studies review at a tertiary care medical center. Patients suffering persistent dizziness following head trauma and demonstrating Tullio phenomena or Hennebert signs are included.