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Table 1 Accuracy of EUS, MR in the detection and staging of ampullary tumors

From: Long-term prognosis of surgical treatment for early ampullary cancers and implications for local ampullectomy

  EUS MR P
T staging 87.8% (72/82) 70.8% (63/89) 0.001
  Overstaging 9.8% (8/82) 12.4% (11/89)  
  Understaging 2.4% (2/82) 22.5% (20/89)  
N staging 65.9% (54/82) 85.4% (76/89) 0.024
  Overstaging 23.1% (19/82) 14.6% (13/89)  
  Understaging 11.0% (9/82) 5.6% (5/89)