Preoperative stratification of Ki-67 proliferation index in intrahepatic mass-forming cholangiocarcinoma via tumor-halo radiomic phenotyping on biparametric MRI: a multicenter diagnostic model. - Xiaomeng Li; Lihong Xing; Liyong Zhuo; Linyan Xue; Jitao Duan; Jinghui Dong; Yanyan Zhang; Ximing Wang; Bing Kang; Xiaoping Yin; Hongjun Li (BMC Medical Imaging, 2026)