Mediastinal Fibrosarcoma in a Dog–Case Report

Alysha M. McGrath, Sarah A. Salyer, Amanda Seelmann, Alycen P. Lundberg, Melissa R. Leonard, Joshua N. Lorbach, Sarah Lumbrezer-Johnson, Eric T. Hostnik, Giovanni Tremolada, Janis Lapsley, Laura Selmic

Research output: Contribution to journalArticlepeer-review


This represents the first published case report of mediastinal fibrosarcoma in a dog. An 8-year-old male neutered mixed breed dog was presented for evaluation of lethargy and increased panting. Thoracic focused assessment with sonography for trauma revealed moderate pleural effusion. Thoracic radiograph findings were suggestive of a cranial mediastinal mass. Computed tomography revealed a mass within the right ventral aspect of the cranial mediastinum. On surgical exploration, a cranial mediastinal mass with an adhesion to the right cranial lung lobe was identified and removed en-bloc using a vessel sealant device and requiring a partial lung lobectomy. Histopathology results described the cranial mediastinal mass as fibrosarcoma with reactive mesothelial cells identified within the sternal lymph node. The patient was treated with systemic chemotherapy following surgical removal. To date, the dog has survived 223 days following diagnosis with recurrence noted 161 days following diagnosis and radiation therapy was initiated. Primary cranial mediastinal fibrosarcoma while a seemingly rare cause of thoracic pathology in dogs, should be considered in the differential diagnosis for a cranial mediastinal mass.

Original languageEnglish (US)
Article number820956
JournalFrontiers in Veterinary Science
StatePublished - Feb 9 2022


  • blunt dissection
  • case report
  • chemotherapy
  • dog
  • doxorubicin
  • fibrosarcoma
  • mediastinum
  • surgery

ASJC Scopus subject areas

  • veterinary(all)


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