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Table 4 Under- and over-staging of tumors by MRI versus frozen section

From: Can addition of frozen section analysis to preoperative endometrial biopsy and MRI improve identification of high-risk endometrial cancer patients?

MRI Number (preoperative stage) Postoperative stage Number %
Under-staged 14 (Ia)    
   Ib 7 50
   IIIa 5 35.7
   IIIb 2 14.3
Over-staged 21 (Ib) 1 (IIIa)    
   Ia 22 100
Frozen section Number (intraoperative histology) Postoperative histology   
Under-staged 26 (Ia)    
   Ib 12 46.2
   II 1 3.8
   IIIa 9 34.6
   IIIb 4 15.4
Over-staged 1(Ib)    
   Ia 1 100