 The investigators will compare MR to two new computed tomography CT techniques - dual energy CT DECT and Subtraction imaging - with regards to their ability to detect features associated with increased risk of malignancy enhancing septa and mural nodules in PCs. For cases where there is disagreement between these 2 CT techniques and MR, histopathology of the surgical specimen or the results of Endoscopic Ultrasound EUS will serve as reference standard. 