Otosclerosis is a focal lesion of unknown origin in the osseous vagus of the inner ear, in which one or several confined, vascularized, spongy new bones are formed in place of the original normal bone in the osseous vagus, hence the name otosclerosis. Tympanosclerosis is a separate disease, which is a degenerative degeneration of the middle ear tympanic chamber left by chronic inflammation and long-term stimulation.