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Multifocal polyostotic aneurysmal bone cysts in a llama

D E Anderson1, L T Midla, P V Scrivani

  • 1Department of Veterinary Clinical Sciences, College of Veterinary Medicine, Ohio State University, Columbus 43210, USA.

Journal of the American Veterinary Medical Association
|March 15, 1997
PubMed
Summary

A llama presented with lameness due to a femur fracture. Diagnosis revealed multifocal polyostotic aneurysmal bone cysts, a rare condition affecting bone structure.

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Area of Science:

  • Veterinary Medicine
  • Comparative Pathology
  • Skeletal Biology

Background:

  • Llamas are susceptible to various orthopedic conditions.
  • Fracture repair in large animals presents unique challenges.
  • Aneurysmal bone cysts (ABCs) are rare, benign bone lesions.

Observation:

  • A 3.3-year-old, 125-kg llama exhibited acute hind limb lameness and femoral crepitus.
  • Radiographs showed a comminuted femoral fracture with associated bone lysis and multiple lesions.
  • Biopsies were negative for infection but revealed fibrous tissue and abnormal bone structure.

Findings:

  • Surgical repair of the initial fracture was unsuccessful, with a subsequent proximal femur fracture observed.
  • Post-mortem examination confirmed multifocal polyostotic aneurysmal bone cysts in the femur and tibia.

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  • Histopathology indicated cysts lined by fibroblasts or endothelial-like cells.

    • Implications:

    • This case highlights the potential for aneurysmal bone cysts to complicate fracture healing in llamas.
    • Understanding the pathogenesis of ABCs is crucial for diagnosis and management in veterinary patients.
    • Further research into the etiology and treatment of ABCs in camelids is warranted.