1. A method for processing, displaying and navigating breast tissue images, comprising: obtaining a plurality of 2D and/or 3D images of a patient's breast, wherein respective images of the obtained plurality of images contain one or more regions defined by X,Y coordinate locations that are common for multiple images of the plurality; generating a synthesized 2D image of the patient's breast by importing respective regions from the obtained plurality of images into a merged image, wherein an image from which a respective region is imported into the merged image comprises a source image for that region, wherein the imported regions are incorporated into the merged image at X,Y coordinate locations corresponding to X,Y coordinate locations of the respective regions in their source image, and wherein one of each said one or more common regions is imported from the plurality of images into the merged image based upon a comparison of one or more attributes of the common region in each image that contains the respective common image; displaying the synthesized 2D image; receiving a user command, or otherwise detecting through a user interface, a user selection or other indication of a region or of an object at least partially contained in said region in the displayed synthesized 2D image; and displaying at least a portion of one or more source images of the user selected or indicated region or object.