1. A method comprising: generating a three-dimensional image space or volume from a plurality of two-dimensional radiological image slices; generating a three-dimensional cursor that has a non-zero volume; displaying the three-dimensional cursor in the three-dimensional medical image space or volume; responsive to a first input, moving said three-dimensional cursor within the three-dimensional medical image space or volume; and responsive to a second input, selecting portions of the two-dimensional radiological image slices corresponding to the volume of the three-dimensional cursor for further processing.