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Related Experiment Video

Updated: Oct 5, 2025

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Type A thymoma in a pet rabbit.

Halley R Robson1, Ryan A Yanez2, Leanne M Magestro1

  • 1Department of Small Animal Clinical Sciences, College of Veterinary Medicine, Michigan State University, East Lansing, MI, USA.

Journal of Veterinary Diagnostic Investigation : Official Publication of the American Association of Veterinary Laboratory Diagnosticians, Inc
|January 31, 2022
PubMed
Summary

A rabbit with a mediastinal mass experienced improved quality of life after palliative radiation therapy. Unfortunately, the rabbit succumbed to dyspnea, with autopsy revealing a type A thymoma.

Keywords:
World Health Organizationdomesticated rabbitsimmunohistochemistryradiation therapythymomatype A thymoma

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Area of Science:

  • Veterinary Medicine
  • Oncology
  • Radiology

Background:

  • A 4-year-old domestic rabbit presented with progressive bilateral exophthalmos.
  • A large mediastinal mass was identified in the cranial thorax.

Purpose of the Study:

  • To describe the diagnosis and palliative radiation therapy of a mediastinal mass in a domestic rabbit.
  • To report on the treatment outcomes and survival time.

Main Methods:

  • Palliative radiation therapy using 3-dimensional conformal radiation therapy (3D-CRT).
  • Four fractions of 5 Gy delivered twice weekly for a total dose of 20 Gy.
  • Image guidance with on-board cone beam computed tomography (CBCT).
  • Immunohistochemical labeling for cytokeratin 5/6 and cytokeratin 7.

Main Results:

  • Quality of life and respiratory rate improved following radiation therapy.
  • The rabbit experienced sudden death due to dyspnea 93 days post-diagnosis.
  • Autopsy confirmed a type A thymoma, positive for cytokeratin 5/6 and 7.

Conclusions:

  • Palliative radiation therapy can temporarily improve quality of life in rabbits with mediastinal masses.
  • Type A thymoma is a potential diagnosis for mediastinal masses in rabbits.
  • Further research is needed to improve outcomes for rabbits with this condition.