Um cão, macho, raça Yorkshire, oito meses de idade, chegou ao Hospital Veterinário da Universidade Federal de Minas Gerais apresentando sinais neurológicos, caracterizados por andar apoiando a cabeça na parede, ataxia, tremores, episódios de cegueira e surdez. O objetivo do presente estudo foi descrever o diagnóstico, por meio de ultrassonografia e portografia, de um caso de shunt extra-hepático em cão, classificado como portoázigos e considerado incomum quando comparado aos demais tipos de desvio portossistêmico. Esses desvios comunicam a VP ou alguma de suas tributárias à veia cava ou, menos comumente, à veia ázigos (VA). Shunt portossistêmico (SPS) é uma comunicação vascular anômala entre o sistema venoso portal e a circulação sistêmica. Ultrasonography and portography were effective at detecting and characterizing the portoazygos shunt despite some limitations.ĭiagnostic imaging canine portosystemic deviatio The PSS was surgically corrected with an ameroid constrictor. The portography revealed enhancement by iodinated contrast in the jejunal vein, the portal vein and an anomalous vessel flowing towards the azygos vein in the craniodorsal region of the abdomen. Ultrasonographic examination revealed a dilated and curved anomalous vessel with approximately 0.6cm of diameter and turbulent flow seen through pulsed and color Doppler, and segmental dilation of the azygos vein. The subject was a male dog, Yorkshire, 8 months old, presented neurological signs characterized by head press, ataxia, tremors and episodes of temporary blindness and deafness. This diagnosis is considered uncommon compared to other portosystemic shunts using ultrasonography and portography. The purpose of this case report was to describe the diagnosis of PSS in a dog classified as porto-azygos. These deviations connect the main portal vein (PV) or some portal branches to the vena cava (VC) or, less commonly, to the azygos vein (AV). Portosystemic shunt (PSS) is an anomalous vascular connection between the portal venous system and the systemic circulation.
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