The disease is classified according to the location of the lesions of the vertebrae and the stage of development of the pathology. According to localization, two types of the disease are distinguished. This pathology does not affect the cervical region, and in general, cervical kyphosis is a very rare occurrence. Both types of the disease have several stages of development, differing in the degree of clinical manifestations. Table. Stages of Scheuermann-Mau disease.