A 62-year-old woman was referred for suspected sacroiliitis discovered incidentally on a CT scan performed for pre-transplant assessment, in a context of chronic renal failure due to nephroangiosclerosis with haemodialysis for 18 months. Her renal disease was complicated by anaemia and secondary hyperparathyroidism. She was completely asymptomatic, including no lumbar or buttock pain. The CT scan (figure 1) showed bilateral and symmetrical subchondral bone resorption of blurred appearance responsible for a pseudo-widening which mainly concerned the iliac …