hyperostosis

[HYPER- + OST(EO)- + -OSIS.]

1. an excessive growth of bone, as in infantile cortical hyperostosis. n 2. hypertrophy of bone. See also exostosis.

1. Excessive or abnormal thickening or growth of bone tissue.
2. See exostosis.

Excessive growth of bony tissue.

• craniomandibular h. — see craniomandibular osteopathy.
• diffuse idiopathic skeletal h. (DISH) — occurs in dogs and pigs; cause unknown, possibly familial in pigs; extensive bone deposition around joints but articular surfaces not affected.
• facial h. — in hyperparathyroidism resorption of cancellous bone, particularly maxillae and mandibles, and the formation of poorly mineralized osteoid and excessive fibro-osseous tissue cause deformities of the face and head that are clinically obvious and may prevent closure of the mouth. Occurs in primary and secondary hyperparathyroidism.
• inherited congenital h. — see juvenile hyperostosis (below).
• juvenile h. — a congenital defect of pigs. The legs of affected newborn pigs are swollen below the elbow. The piglets have difficulty standing and moving around. The bone is thick and the periosteum rough and there is extensive edema. Called also thick forelegs, inherited congenital hyperostosis.