Osteogenesis imperfecta type III is a severe type of osteogenesis imperfecta (OI; see this term), a genetic disorder characterized by increased bone fragility, low bone mass and susceptibility to bone fractures. The main signs of type III include very short stature, a triangular face, severe scoliosis, grayish sclera, and dentinogenesis imperfecta (DI; see this term).