Figure 2. (a) 2 months later, helical CT shows enlargement of the gastric mass (large arrow), with tumour invasion of the duodenum, pancreas head and superior mesenteric vein (small arrow). (b) The main portal vein is invaded by the tumour (small arrow) and the lumen of the main portal vein is narrowed. An enlarged retroportal lymph node is seen (large arrow). (c) Fusiform dilatation of the right portal vein is present.