• A 68-year old male

  • Chronic low back pain, exacerbated by flexion and extension

  • History of chronic dorsal and lumbar pain

Fig. 1
figure 1

(a, b) Sagittal and axial TSE T2-weighted images with fat saturation (a, b). Facet joint effusion at L4/L5 bilaterally, with widening of the joint spaces (arrows)