Resumo O osteocondrossarcoma multilobular é uma neoplasia incomum em cães que costuma ocorrer nos ossos planos do crânio, apresentando-se comumente como uma massa fixa e de consistência firme. No presente estudo relata-se o caso de uma cadela de 13 anos de idade, sem raça definida com histórico de aumento de volume craniano progressivo. Após análise clínica sugeriu-se a avaliação tomográfica complementar do crânio. O exame foi realizado antes e após a administração de contraste iodado intravenoso e as imagens demonstraram extensas lesões líticas e proliferativas em osso frontal e parietal bilateralmente com aspecto de "bola de pipoca" promovendo compressão e deslocamento do parênquima cerebral, meninges e globo ocular esquerdo. Os achados tomográficos foram compatíveis com osteocondrossarcoma multilobular, sendo sugerida a remoção cirúrgica da massa. A excisão cirúrgica foi considerada inviável tendo em vista a agressividade das lesões e o estado geral do paciente, sendo instituído tratamento paliativo. Devido a evolução dos sinais clínicos, o médico veterinário responsável optou pela eutanásia. Análise histopatológica pós-morte de fragmentos da lesão confirmaram a suspeita clínica de osteocondrossarcoma multilobular. Ressalta-se o incomum achado desta neoplasia na espécie canina e a contribuição do exame tomográfico para melhor caracterização e estadiamento da doença, sendo o diagnóstico precoce importante para instalação do protocolo terapêutico adequado e melhora do prognóstico.Palavras-Chave: tomografia computadorizada, crânio, neoplasia. AbstractMultilobular osteochondrosarcoma is an uncommon neoplasm in dogs that usually occurs in the flat bones of the skull, commonly presenting as a fixed mass and with a firm consistency. In the present study, the case of a 13-year-old bitch without defined breed and with history of progressive cranial volume increase is reported. After the clinical analysis, the complementary tomographic evaluation of the skull was suggested. The examination was performed before and after administration of intravenous iodinated contrast and the images showed extensive lytic and proliferative lesions in the frontal and parietal bones bilaterally with the appearance of a "popcorn ball" causing compression and displacement of the cerebral parenchyma, meninges, and left eyeball. The tomographic findings were compatible with multilobular osteochondrosarcoma, and surgical removal of the mass was suggested. Surgical excision was considered impractical in view of the aggressiveness of the lesions and the general condition of the patient, and palliative treatment was instituted. Due to the evolution of clinical signs, the veterinarian opted for euthanasia. Post-mortem histopathological analysis of lesion fragments confirmed the clinical suspicion of multilobular osteochondrosarcoma. Attention is called to the unusual finding of this neoplasm in the canine species and the contribution of the tomographic examination for better characterization and staging of the disease, where early diagnosis is im...
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