Axial (A) and lateral (B) illustrations of Tomita anatomic classification of primary spinal malignant tumors. Lesions are classified by their location on vertebra using numeric scheme that reflects most common progression of tumor growth: 1, vertebral body; 2, pedicle; 3, lamina and transverse and spinous processes; 4, spinal canal and epidural space; and 5, paravertebral space.