Fig. 1

A The black arrow above indicates Modic changes of the mid endplates, the white arrow above indicates Modic changes of the posterior corners of the endplates, and the white arrow below indicates irregularities of the mid endplates. B The white arrow above indicates posterior marginal nodes, and the black arrow above indicates dorsal corner defects. The white arrow below indicates heterogeneous low signal intensity of extruded material. The black arrow below indicates mid endplates irregularities