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Primary extraskeletal chondrosarcoma in the axillary region of a dog with review of the literature

An eight-year-old, intact male English springer spaniel was presented with a five-month history of right forelimb lameness. MRI revealed a right axillary mass with associated nerve root thickening. Radiographs showed no evidence of bone involvement or pulmonary metastasis. A biopsy was taken of the mass, and histopathological examination was consistent with a high-grade chondrosarcoma. Conservative treatment was elected, and the patient euthanased four months later, after which postmortem examination was performed.