Example of pathological MRI (T1-weighted sequence after gadolinium) of the ankle from a patient with peripheral spondyloarthritis (female, 46 years). ‘O’, tendinitis; *, bone marrow oedema; fat arrow, sub-Achillean bursitis; thin arrow, oedema in the tendon of the plantar aponeurosis, in this case due to a plantar spur.