Canis ISSN: 2398-2942

Foreign body migration

Introduction

  • Cause: penetration of body by sharp foreign body.
  • Signs: usually vague/systemic may be localized.
  • Diagnosis: imaging of foreign body.
  • Treatment: removal.
  • Prognosis: guarded.

Pathogenesis

Etiology

  • Usually caused by long eared grass seed.
  • Can be splinter of wood.
  • Any other sharp foreign body.

Predisposing factors

General
  • Long haired breeds are more likely to get grass seeds trapped unnoticed in coat.
  • Disposition of dog (those running through corn fields or dense undergrowth more likely to acquire foreign body).

Specific

  • Foreign body enters through skin, penetrates oropharynx or via respiratory system.
  • Once in body foreign body tracks along fascial planes or through body tissues:
    • May carry infection with it or set up inflammatory reaction.
    • Trauma caused by foreign body may be significant, eg pleural puncture → pneumothorax.
    • May cause problems as a result of FB reaction, eg pyothorax.
  • Inhaled FB:
    • May puncture pleura → pneumothorax, pyothorax or mediastinitis.
    • Alternatively track along diaphragm to lumbar vertebrae → diskospondylitis.
  • Pharyngeal FB may cause retrobulbar swelling.

Timecourse

  • Weeks to years.

Diagnosis

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Treatment

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Outcomes

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Further Reading

Publications

Refereed papers

  • Recent references from PubMed and VetMedResource.
  • Frendin J, Grecko C et al (1994) Thoracic and abdominal wall swellings in dogs caused by foreign bodies. JSAP 35 (10), 499-508 VetMedResource.
  • Lamb C R, White R N & McEvoy F J (1994) Sinography in the investigation of draining sinus tracts in small animals - retrospective review of 25 cases. Vet Surg 23 (2), 129-134 PubMed.
  • Johnston D E & Christie B A (1990) The retroperitoneum in dogs - retroperitoneal infections. Comp Cont Ed Pract Vet 12 (8), 1035-1045 VetMedResource.
  • Morgan R V (1989) Ultrasonography of retrobulbar diseases in the dog and cat. JAAHA 25 (4), 393-399 VetMedResource.
  • White R A S & Lane J G (1988) Pharyngeal stick penetration injuries in the dog. JSAP 26 (1), 13-35 VetMedResource.


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