Metastatic extramedullary plasmacytoma in a canine
DOI:
https://doi.org/10.1590/1809-6891v24e-75186EAbstract
Plasmocytomas are neoplasms originating from malignant plasma cells and can be subdivided into cutaneous extramedullary, non-cutaneous and multiple myeloma. The involvement of vertebrae can generate clinical signs of pain and neurological alterations according to the affected segment, with the appearance of metastases being uncommon. The present study aims to report a case of extramedullary plasmacytoma with primary site in the thoracic vertebra and with consequent spinal cord compression and metastases, characterizing its clinicopathological aspects. The patient was hospitalized, submitted to laboratory and imaging tests, and medicated due to incoordination and loss of perception of limb positioning, but his clinical condition worsened, progressing to loss of movement and fecal and urinary incontinence, resulting in death. The main necropsy findings were the presence of a tumor mass along the external surface of the body of the fifth thoracic vertebra, in addition to light brown foci in the thoracic spinal cord and in the pulmonary and splenic parenchyma. Histologically, the tumor mass and light brown foci consisted of malignant cell proliferation, of plasmacytic origin, densely cellular and largely infiltrative. Thus, through the clinical picture presented, image exams and anatomopathological analysis, it was evidenced that it was a case of atypical extramedullary plasmocytoma, with metastasis in the spinal cord, lung and spleen.
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