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A cholesteatoma is an abnormal skin growth in the middle ear behind the eardrum. D. Richard Kang, Board Certified Pediatric Otolaryngologist at the Boys Town Ear, Nose & Throat Institute and Director of the Cochlear Implant Center, explains what causes a cholesteatoma, the symptoms and dangers it can cause, and how it is treated. For more information about Dr. Kang, visit www.boystownhos...