1. Patients referred for medical imaging at Sunnybrook Health Sciences Centre and have imaging findings consistent with focal hepatic lesion(s) on conventional US, CECT and/or MRI, characteristic of a specific hepatic tumour (benign or malignant), greater than 1.5cm in size and located within a portion of the liver readily amenable to US assessment. An abdominal radiologist and/or surgical oncologist will identify patients. Recruitment will occur prior to baseline imaging (at time of imaging requisition receipt) or immediately following baseline imaging, either by the study coordinator or surgical oncologist.