We performed the study to develop and validate a method for measuring the depth of tumor invasion (DoI) on magnetic resonance imaging (MRI) and to investigate the diagnostic performance of the measured DoI for stratifying T classification in patients with distal bile duct cancer. Our result showed that this newly developed method reliably measured DoI on T2-weighted MR images, and can be used for the preoperative T classification of distal bile duct cancer patients.
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