Once your liver has become fibrotic enough to cause
portal hypertension, then your collateral vessels will be affected (if linked to the
portal venous system). But these are mostly internal as in: gastric varices, esophageal varices or other upper and lower GI collaterals. Your outer surface stomach region may show some strange vein issues due to the recanalisation of the paraumbilical vein, but these are quite pronounced (scary looking too, called "caput medusae").