Current Status of Imaging to Evaluate Liver Metastases From Colorectal Cancer

Abstract

Multiple imaging modalities are routinely used to identify, characterize, and clinically follow colorectal cancer liver metastases. These include ultrasound, computed tomography, magnetic resonance imaging, and positron emission tomography. Within each modality, there exist multiple variations of protocol, which could include addition of contrast, acquisition of specific imaging sequences, or combination of images with those of another modality. In addition to considerations of imaging protocols and equipment, one must also consider patient-specific factors to determine appropriate imaging for colorectal cancer liver metastases. Specifically, whether the patient has been treated systemically or locally is important in determining imaging strategy. This review highlights the benefits, limitations, and variations of each modality and offers comparative data among the imaging techniques.