A template for the localization of lesions in a breast. The template includes a substrate of transparent material that includes a central marking; a horizontal line extending through the central marking; a first series of spaced lines, each line of the first series being perpendicular to the horizontal line and each line including marking indicia for indicating the distance of that line from the central marking; an oblique line extending approximately 45 degrees from the horizontal line and through the central marking; and, a second series of spaced lines, each line of the second series being perpendicular to the oblique line and each line including marking indicia for indicating the distance of that line from the central marking. There is a right breast template and a left breast template. The appropriate template is utilized and the CC and MLO views of a mammogram are used to define a CC line and an MLO line that are plotted on that template. The intersection of these two lines is indicative of the location of the lesion. The template can then be placed over the breast of the patient and a lesion-indicative marking can be placed on the patient's skin.
