Comparison of magnetic resonance imaging (MRI) and angio computed tomography ( Angio CT) in the characterization of liver lesions in patients with colorectal cancer and possible liver metastases

Interventions: patients will undergo primovist MRI as part of their work up for presentation with colorectal cancer liver metastases (CRCLM) most patietns will undergo one MRI but may have a second if they need neoadjuvant chemotherapy and then restaging for possible surgery. MRI usually takes about 30 minutes. Primary outcome(s): assessing accuracy of primovist MRI compared to angio CT. both tests will be reported by 2 radiologists blinded to results of the other imaging modality. tis will allow assessment of interobserver variability as well as accuracy of test. all 4 reports will be correlated with histopathology from surgery to assess accuracy of the tests.[measured postoperatively when histopathology available] Study Design: Purpose: Diagnosis; Allocation: Non-randomised trial; Assignment: Single group;Type of endpoint: Safety/efficacy