1. A method of analyzing a lesion in a medical digital image using a processor using at least one point contained within a lesion to be analyzed comprising: (a) propagating a wave-front surface from the at least one point for a plurality of steps; (b) partitioning the wave-front surface into a plurality of wave-front parts wherein each wave-front part is associated with a different portion of the wave-front surface corresponding to a previous propagation step; and (c) analyzing at least one feature associated with each wave-front part to classify anatomical structures associated with the lesion and normal anatomy within the medical digital image.