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Vertebral telangiectatic osteosarcoma in a dog
Author(s) -
Brellou G.,
Papaioannou N.,
Patsikas M.,
Polizopoulou Z.,
Vlemmas I.
Publication year - 2004
Publication title -
veterinary clinical pathology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.537
H-Index - 51
eISSN - 1939-165X
pISSN - 0275-6382
DOI - 10.1111/j.1939-165x.2004.tb00367.x
Subject(s) - pathology , osteosarcoma , immunohistochemistry , medicine , malignancy , differential diagnosis , stromal cell , giant cell , bone marrow , vertebra , anatomy
Telangiectatic osteosarcoma (TOS) affecting the seventh cervical vertebra (C7) was diagnosed in a 4‐year‐old male dog with signs of locomotor dysfunction. Bone lysis and an extradural‐extramedullary mass were observed in radiographs and occipital myelograms. The diagnosis was confirmed by histopathologic and immunohistochemical examination of the mass. The tumor was composed of large blood‐filled cavities lined by anaplastic stromal cells (malignant osteoblasts). Around the cavities were characteristic tumor giant cells (“bizarre cells”). Immunohistochemically the tumor cells were positive for proliferating cell nuclear antigen. The lining cells of the cysts were negative for von Willebrand factor. The histologic findings in this case of TOS involving C7 were similar to those seen in other cases of TOS in dogs and in people. Immunohistochemistry was a useful tool for assessing malignancy and for ruling out other differential diagnoses.