Conclusions Osteitis fibrosa cystica is a tumor - like lesion of bone, because of the endocrine disorder caused by par-athythroid tumor or hyperplasia;

Most often, this is the result of a small benign tumor in one of your four parathyroid glands .

This tumor is a component of Sipple's syndrome, which is characterized by medullary carcinoma of the thyroid, pheochromocytoma, and hyperparathyroidism.