Purpose: To assess the morphological features and the accuracy of T staging images in surgically-proven gallbladder cancers, retrospectively. Materials and Methods: Images of 59 surgically-proven gallbladder cancers were reviewed. Morphologic features, shape, size of tumors and the presence of stones or sludge within the images were evaluated and correlated with surgicopathologic findings. Results: Polypoid masses were shown in 49 cases (83%). The sizes of tumors were well correlated with surgicopathologic T-stage. With ROC evaluation, the size cutoff point to differentiate the ≤ T1 versus ≥ T2 lesions was 2.4 cm. Stones or sludge were found in 25 cases (42%). The positive predictive value, negative predictive value, sensitivities, specificities, and accuracy of the ability to differentiate the ≤ T1 versus ≥ T2 lesions were 75%, 86%, 46%, 96%, 85% and those of the ability to differentiate ≤ T2 versus ≥ T3 lesions were 89%, 49%, 45%, 90%, and 61%, respectively. Conclusion: Image analysis showed that polypoid mass and wall thickening were major findings. With this in mind, polypoid mass shows the possibility of gallbladder cancer originating from adenoma, even if the size is larger than 2 or 2.4 cm, the surgicopathologic stage could be low. Moreover, the accuracy of image based T stage on pericholecystic infiltration and wall thickening was low. , 크기, 담낭결석 동반여부, TNM 병기분류법에 따른 병기 결정을 분석하였으며, 수술 후 병리조직 소견과 비교하였다.결과: 전체 59예 중 폴립성종양형이 49예(83%)를 차지하였으며 병변의 크기가 클수록 수술 후 병기가 높아지는 양상 을 보였다. ROC curve를 분석한 결과 폴립성종양형 병변의 경우 T1과 T2 이상 병기를 구분하는 적절한 기준 크기(cutoff point)는 2.4 cm였다. 전체 59예 중 25예(42%)에서 담석 또는 담즙 찌꺼기가 동반되었다. 영상진단에서의 T1 병기 판정의 양성예측도, 음성예측도, 민감도, 특이도, 정확도는 75%, 86%, 46%, 96%, 85%였으며, T2 이하와 T3 이상의 병기 판정에 대해서는 89%, 48%, 45%, 90%, 61%였다.