Osteosclerosis

Osteosclerosis, an elevation in bone density, is normally detected on an X-ray as an area of whiteness, and is where the bone density has significantly increased. Localized osteosclerosis can be caused by injuries that compress the bone, by osteoarthritis, and osteoma.

It is associated with:
 * Melorheostosis
 * Osteopetrosis
 * Osteopoikilosis
 * Chronic idiopathic myelofibrosis

It can also be associated with Hepatitis C.

Osteosclerotic bones provide ballast to aquatic air-breathers.