Ishikawa classification of venous involvement by pancreatic ductal adenocarcinoma

Ishikawa classification system describes the degree of involvement of adjacent portal vein and SMV by pancreatic ductal adenocarcinoma based on caliber of the vein:

  • type I: normal 
  • type II: smooth shift/displacement with normal caliber  
  • type III: unilateral narrowing 
  • type IV: bilateral narrowing
  • type V: bilateral narrowing with collateral formation

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rID: 52827
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