There is a lobulated epidural structure at L4-L5 level of right lateral location, extending through the adjacent exit foramen, and posterior L4-L5 disc space, with mass effect on the ipsilateral L5 nerve root as well as the thecal sac. It appears of low signal intensity on T1WI, inhomogeneous high signal intensity on T2WI with peripheral enhancement and restricted diffusion on DWI/ADC. The posterior half of L5 vertebral body and its right pedicle show low signal on T1WI, high signal on T2WI with enhancement, indicating spondylitis. There is an irregularity with the erosion of the adjacent posterior vertebral wall of L5. The right paravertebral muscles show an oedematous infiltration with enhancement on postcontrast sequences (myositis).