Abstract
The possibility of a common aetiology of otosclerosis and osteogenesis imperfecta is discussed. The histopathological differences in two temporal bones, one with osteogenesis imperfecta congenita and one with co-existing osteogenesis imperfecta tarda and otosclerosis, are emphasized. On the basis of the methods currently used it cannot be confirmed, that otosclerosis and osteogenesis imperfecta have a common aetiology.