Figure 5c. Proper imaging technique. (a) Right craniocaudal screening mammogram obtained in a 65-year-old woman demonstrates underpenetration. (b) Right mediolateral oblique mammogram reveals an irregular density (arrow) that was obscured on the craniocaudal view. (c) Right craniocaudal spot magnification mammogram demonstrates an irregular mass with microcalcifications. At pathologic analysis, the mass proved to be invasive ductal carcinoma.