exostosis

[Greek exostōsis : ex-, out of; see exo- + osteon, bone + -ōsis, -osis.]

(hyperostosis) a bony growth projecting from a bony surface.

A benign growth of cartilage or bony material that may occur spontaneously or as a result of the margins of a joint knocking against each other. See also blocker's exostosis.

Pl. exostoses [Gr.] a benign new growth projecting from a bone surface and characteristically capped by cartilage.

• e. cartilaginea — a variety of osteoma consisting of a layer of cartilage developing beneath the periosteum of a bone.
• inherited multiple e. — a benign hereditary disorder in horses. The lesions are visible externally but appear to cause little inconvenience. Similar to multiple cartilaginous exostoses (see below) in dogs and cats.
• multiple cartilaginous e's — multiple bony exostoses in bones formed by enchondral ossification are seen in young dogs, usually on vertebrae, ribs and long bones. Adult cats are infrequently affected, and mainly on cranial bones. The bony enlargements are painless, but may cause musculoskeletal or neurological dysfunction. Neoplastic transformation has been reported. An hereditary basis is suspected in dogs. Called also diaphyseal aclasis, metaphyseal aclasis, osteochondromatosis, and in horses, inherited multiple exostosis (see above). See also osteophyte.
• periarticular e. — occurs in any joint injury, commencing as cartilaginous osteophytes within a few days of the injury occurring.

Exostosis
Classification and external resources
ICD-9	726.91
DiseasesDB	18621
MeSH	[1]

An exostosis (plural: exostoses) is the formation of new bone on the surface of a bone.^[1] Exostosis can cause chronic pain ranging from mild to debilitatingly severe, depending on where they are located and what shape they are.

The overgrowth of outer ear canal bone is the body's way of protecting the ear drum from the frequent rush of cold water against it which commonly occurs with surfing. They develop over many years and result in infections, pain, plugging and hearing loss.

When used in the phrases "Cartilaginous exostosis" or "Osteocartilaginous exostosis", it is considered synonymous with Osteochondroma. Some sources consider the terms to mean the same thing even without qualifiers, but this interpretation is not universal.

Contents 1 Related conditions 2 See also 3 References 4 External links

Related conditions

• Surfer's ear (Exostosis of the ear canal)
• Hereditary multiple exostoses (HME)
• Subungal exostosis
• Buccal exostosis

See also

• Osteoma
• Ganglion cyst
• Bone spur

References

1. ^ exostosis at Dorland's Medical Dictionary

External links

• The Ear and Balance Center, The Sonos Group
• MHE Research Foundation (Multiple Hereditary Exostoses)
• -1691025402 at GPnotebook (equates "Exostosis" with "osteochondroma")]

This medical article is a stub. You can help Wikipedia by expanding it.

v • d • e Musculoskeletal disorders: Arthropathies (M00-M19, 711-719) Arthritis (monoarthritis/ polyarthritis) Inflammation (Neutrophilia) Infectious Septic arthritis · Tuberculosis arthritis · Reactive arthritis (indirectly) Noninfectious Seronegative spondyloarthropathy: Reactive arthritis · Psoriatic arthritis · Ankylosing spondylitis Rheumatoid arthritis: Juvenile idiopathic arthritis · Adult-onset Still's disease · Felty's syndrome Crystal arthropathy: Gout · Chondrocalcinosis Noninflammatory Osteoarthritis: Heberden's node · Bouchard's nodes Other hemorrhage (Hemarthrosis) · pain (Arthralgia) · Osteophyte · Hypermobility · villonodular synovitis (Pigmented villonodular synovitis) see also congenital

v • d • e Osteochondropathy (M80-M94, 730-733) Osteopathies Osteitis endocrine bone disease: Osteitis fibrosa cystica (Brown tumor) infectious bone disease: Osteomyelitis (Sequestrum, Involucrum) · Sesamoiditis · Brodie abscess · Periostitis Bone density and structure Density / metabolic bone disease Osteoporosis · Osteopenia · Osteomalacia Continuity of bone Pseudarthrosis · Stress fracture Other Fibrous dysplasia (Monostotic, Polyostotic) · Skeletal fluorosis · bone cyst (Aneurysmal bone cyst) · Hyperostosis (Infantile cortical hyperostosis) · Osteosclerosis (Melorheostosis) Bone resorption Osteolysis · Hajdu-Cheney syndrome · Ainhum Ischemia Avascular necrosis Other Paget's disease of bone · Algoneurodystrophy · Hypertrophic pulmonary osteoarthropathy · Nonossifying fibroma Chondropathies Chondritis Relapsing polychondritis Other Tietze's syndrome Both Osteochondritis Osteochondritis dissecans Juvenile osteochondrosis lower limb: hip (Legg–Calvé–Perthes syndrome) · tibia (Osgood-Schlatter disease, Blount's disease) · foot (Köhler disease, Sever's disease) upper limb: wrist (Kienbock's disease) see also osteochondrodysplasia, neoplasia

This entry is from Wikipedia, the leading user-contributed encyclopedia. It may not have been reviewed by professional editors (see full disclaimer)