History

A 46-year-old female was referred with a 2-year history of worsening low back pain, with occasional night pain and difficulty walking. On examination she had mild discomfort on palpation over her lower lumbar spine Figs. 1, 2, 3 and 4.

Fig. 1
figure 1

Lateral radiograph of the lumbar spine

Fig. 2
figure 2

a Axial and b sagittal CT

Fig. 3
figure 3

a Sagittal T1W SE MR image b axial T2W FSE and c sagittal STIR MR images

Fig. 4
figure 4

a Microphotograph (H&E, 5× magnification). b Nuclear immunostain positive for brachyury