Estudo radiográfico e por tomografia computadorizada das formações orais em cães / Radiographic and computed tomographic studies of oral tumors in dogs

AUTOR(ES)
DATA DE PUBLICAÇÃO

2008

RESUMO

The oral cancers represent the fourth most common cancer in dogs. Imaging of oral cancer is needed to determine the tumor extension and the affected local tissues, assisting in prognosis and surgical planning. Currently the radiographic examination is the most used diagnostic method. It is accessible and less expensive, but the large number of structures in the skull and its overlaping harms the evaluation of this region. The CT scan eliminates overlaping by sectional cuts of the examined region. The objective of this study was to determine the diagnostic value of radiography and tomography of oral cancers in dogs. At the Imaging Diagnostic Service of the HOVET FMVZ-USP, simple radiographies and simple and contrasted CT of 31 dogs with oral tumors attended at the Laboratory of Comparative Dentistry of the same institution were perfomed. The malignant neoplasms were most frequent (85.2%), being the melanoma the most frequent histopathologic type (37.1%). Males were slightly more affected than females, and the highest number of cases were seen in pure breeds dogs, being the Poodle, Cocker and German shepherd breeds the most affected ones. The average age of the animals was 9.97 years. The CT showed bony changes in 87,1% of the cases, X ray in 77,4%, in these changes osteolysis predominated. While the radiographic examination showed invasion in 20% of cases, computed tomography identified in 80.6%. Associating the results of histopathology and tomography, it was possible to verify that the malignant tumors had a strong tendency to be homogeneous and to present heterogeneous enhancement. It follows that from the imaging examinations performed it was not possible to infer the histopathologic type of the oral neoplasms. The CT scan was more detailed and precise than the radiographic exam in the detection of bone commitment and in identifying the bones affected. Besides CT noticed the invasion of tissues adjacent to the tumor in a greater number of cases, thus demonstrating its importance in determining the prognosis and viability of treatment, as well as in planning the surgery.

ASSUNTO(S)

tomografia computadorizada por raios x dogs neoplasias bucais computed tomography cães cavidade oral diagnostic imaging neoplasm diagnóstico por imagem oral cavity

ACESSO AO ARTIGO

Documentos Relacionados