osteitis fibrosa cystica osteitis fi·bro·sa cys·ti·ca (fī-brō'sə sĭs'tĭ-kə)
n.
The resorption and replacement of calcified bone with fibrous tissue caused by hyperparathyroidism or similar conditions that affect the concentration of mineral salts such as calcium and phosphorus. Also called Recklinghausen's disease of bone.