甲状旁腺功能亢进病人骨棕色瘤。高甲状旁腺激素水平提高了破骨细胞的活性并导致不规则的骨溶解吸收，伴随微骨折、出血、巨噬细胞增殖及纤维性结缔组织增生。
Here is a "brown tumor" of bone in a patient with hyperpara-thyroidism. The high parathormone levels increase osteoclast activity and produce irregular bone resorbtion with microfractures and hemorrhage and macrophage proliferation and fibrous connective tissue proliferation.