1. A data structure for use by a computer system for processing medical image data representing at least one first region of a patient including at least one computer-detected feature of interest, the data structure comprising: first computer code executable to detect first data representing at least one second region, included within a respective said first region, wherein at least one said feature of interest in said second region has a significant likelihood of representing a computer-detected false positive; and second computer code executable to provide second data for enabling at least one said first region to be displayed on a display device, such that at least one said second region is displayed on the display apparatus differently from part of said first region not containing features of interest having a significant likelihood of representing computer-detected false positives.