A system for efficiently displaying medical data to a user. For one or more of the image series, the system displays a thumbnail image representing the image series in a secondary segment of a display. In response to a selection of one of the displayed thumbnail images the system displays in the secondary segment a positioning grid with multiple sections, each section representing a section of a separate primary segment of the display that does not overlap the secondary segment. In response to a selection of one of the sections in the positioning grid the system updates the display to cause an image in the image series corresponding to the selected thumbnail image to be displayed in the section of the primary segment of the display represented by the selected section of the positioning grid.