abnormalities in the development of the vertebral-motor segments, among which transitional vertebrae are often diagnosed, including LV sacralization, often cause pain in the lumbosacral spine (Bertolotti syndrome). There are few publications devoted to this pathology in the Russian medical literature. Assessment of patient complaints, careful collection of anamnesis, interpretation of data from clinical neurological examination and instrumental diagnostics, such as R – graphy, MRI, MSCT of the lumbar spine allows you to establish an accurate diagnosis and choose the most effective way of treatment.