Canis ISSN: 2398-2942

Craniomandibular osteopathy

Synonym(s): Westie's disease, lion jaw

Contributor(s): Kyle Braund

Introduction

  • Rare: proliferation of new bone on mandibular rami and temporal bones (occasionally others).
  • Cause: unknown (possibly genetic).
  • Signs: pain on chewing and jaw opening.
  • Diagnosis: signs, radiography.
  • Treatment: symptomatic.
  • Prognosis: self-limiting: changes reverse with skeletal maturity (more than 8 months) - ankylosis of temporomandibular joint (TMJ) usually permanent.

Pathogenesis

Etiology

  • Autosomal recessive inheritance in WHW.

Pathophysiology

  • Normal lamellar bone is replaced by coarse fibrous bone on mandibular rami, temporal bones and, occasionally, on other bones of skull and long bones of limbs.
  • Bone marrow - fibrocellular appearance, often inflammatory cell invasion, increased vascularity.

Timecourse

  • 3-7 months until symptoms.
  • Self-limiting from 8 months - bone changes reverse (except TMJ ankylosis).

Diagnosis

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Treatment

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Prevention

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Outcomes

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Further Reading

Publications

Refereed papers

  • Recent references from PubMed and VetMedResource.
  • Franch J et al (1998) Craniomandibular osteopathy in two Pyrenean mountain dogsVet Rec 142 (17), 455-459 PubMed.
  • Munjar T A et al (1998) Comparison of risk factors for hypertrophic osteodystrophy, craniomandibular osteopathy and canine distemper virus infectionVet Comp Orthop Traumatol 11 (1), 39-43 VetMedResource.
  • Hudson J A et al (1994) Computed tomography of craniomandibular osteopathy in a dogVet Radiol Ultrasound 35 (2), 94-99 VetMedResource.


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