Notification of abstract acceptance
announced via E-mail on July 31st.
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Oct. 18 (Thu)  Grand Ballroom 103 Room - SS03 AB
10:30-10:40 [SS 03 AB-06] 
T-staging of Gallbladder cancer: Is it helpful to add MR imaging on CT imaging in difficult T-staging cases?
   
Speaker Ijin Joo (Seoul National University Hospital)
Authors Ijin Joo,Jae Young Lee1,Jee Hyun Baek1,Soo Jin Kim2,Jung Hoon Kim1,Joon Koo Han1,Byung Ihn Choi1
Affiliation Seoul National University Hospital1,National Cancer Center2
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PURPOSE:
To evaluate the diagnostic performance of MR imaging in patients who had provided a difficulty in the preoperative T-staging of gallbladder cancer on CT.

MATERIALS AND METHODS:
Thirty-six patients with a surgically proven gallbladder cancer (T1:8, T2:18, T3:10) who had additionally undergone preoperative MR imaging due to the debate for T-staging on CT were included in this study. Two abdominal radiologists independently reviewed CT and MR imaging separately for T-staging, according to the published criteria. The results were compared with the pathologic T-staging. For statistical analysis, kappa statistics, McNemar and Fisher¡¯s exact test were used.

RESULTS:
Reviewer 1 accurately diagnosed in 19 of 36 patients (52.7%) at CT and 18 patients (50%) on MR imaging, whereas reviewer 2 correctly diagnosed in 18 (50%) on CT and 22 (61%) on MR imaging. No statistical significance was not noted between CT and MR staging regarding rates of accuracy, overstaging and understaging. Reviewer 2 showed considerable increase of accurate diagnosis rate in T3 gallbladder cancer (60% à 90%), but it was not statistically significant (p > 0.05). Interobserver agreements between the two reviewers were 0.475 on CT and 0.378 on MR imaging.

CONCLUSION:
Addition of MR imaging did not show any significant change in preoperative T-staging of gallbladder cancer in difficult T-staging cases on CT. New T-staging criteria would be needed to increase the diagnostic performance in such cases.

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