Hypophosphatemic rickets with sacroiliitis-like presentation in an adolescent.

Rickets can manifest with a wide variety of rheumatic symptoms. In this paper, a fifteen year old female patient with hypophosphatemic rickets presenting with symptoms suggesting sacroiliitis at disease onset is reported. The sacroiliac joint involvement in this case was attributed to the subchondral bone fractures due to the secondary hyperparathyroidism. Her symptoms resolved completely after treatment with calcitriol and phosphate solution for hypophosphatemic rickets.