The tympanic scarring produces tympanosclerosis, which is also called tympanic ventricular vitreous degeneration, and is caused by the deposition of plaques of collagen tissue under the epithelium of the tympanic mucosa, mostly on the tympanic ventricular mucosa and the auditory bone. It involves the upper tympanic chamber more severely and the lower tympanic chamber less severely, with the hammer bone, anvil, stapes and tendons being the most susceptible, thus causing much deafness. It was discovered by Cassebohm in the 18th century, but did not receive much attention until the recent era (1955), when a large number of microscopic otologic procedures were performed. 1. Otosclerosis: Otosclerosis is a disease in which the dense lamellar bone of the osseous vagus is focally replaced by new spongy bone rich in cells and blood vessels, which can exist without symptoms and is only seen in autopsies. In otosclerosis, there is no history of otitis media, the tympanic membrane is normal, and progressive deafness, so it is not difficult to differentiate. 2. Adhesive otitis media: Adhesive otitis media is a hyperplasia or scar formation of fibrous tissue in the middle ear as a result of previous inflammation of the middle ear. It often develops in childhood. It is difficult to differentiate between tympanic scarring and adhesive otitis media, and sometimes surgical exploration is required to confirm the diagnosis.