An attempt was made to explain the unusual clinical manifestations at the example of an observation of a spinal-marrow tumor, which had the neurological lesion symptoms only below the upper-thoracic level. Scoliosis with a minor spinal deformation at the level of the fourth thoracic vertebra was a tumor symptom. It is suggested that the spinal scoliosis, having a mechanical impact on the spinal marrow and on its provision with blood in the minor-deformation location, was the reason of impaired sensitivity and movements, which is indicative of the spinal-marrow lesion not only in the mentioned locations but also in the total length of tumor localization. Since scoliosis can be, for some time, a single sign of the spinal-marrow lesion, the authors believe it advisable to make the magnetic-resonance therapy (MRT) in all patients with persistent scoliosis for the purpose of an early detection of a spinal-marrow neoplasm, thus, ensuring better treatment results.