The liver presented subnormal size primarily left lateral lobe atrophy and slight atrophy of the right lobes. A large portosystemic shunt likely a splenoazygos or deep splenocaval shunt was noted deriving from the area prior to the portal hilus in the region of the splenic vein as it reaches a juncture to the portal vein creating a large dilation at maximum width of 1.6cm coursing craniodorsally along the area of the esophageal inlet and entering the esophageal inlet into the thorax slightly ventral to the esophagus. This appeared to enter either into the thoracic portion of the caudal vena cava or the azygos vein in the thorax. This should be amenable to ameroid constrictor therapy. Concurrent liver biopsy would also be recommended given that mild increased portal markings were also noted. The preshunt CVC aortic ratio was 1:1. The post shunt ratio cranial to the area of where the shunt derives from the portal apparatus yields a residual portal vein of 0.58cm with an aortic and caval ratio of 1:1. No differential between the vena cava and aorta were noted is the abdomen. However it is difficult to assess where this shunt finalized as it appears to enter into the thoracic inlet prior to meeting the vena cava or the azygos vein. Ameroid placement at the area of the portal vein derivation should be adequate however this is an excessively large shunt at 1.6cm.