A lesion moved up on the ML projection from its original position on MLO. The location of the lesion within the breast is where?

A lesion moved up on the ML projection from its original position on MLO. The location of the lesion within the breast is where?

• A. Medial
• B. Central
• C. Lateral
• D. Posterior

Answer: (A)

Two-view localization using MLO and ML relies on how tissue projects differently when viewed from oblique angles. The MLO view shows the breast from an oblique angle that emphasizes different regions than the ML (medial-lateral) view. When a lesion appears higher on the ML projection than it did on the MLO projection, that upward shift indicates the lesion lies toward the inner, or medial, portion of the breast. Medial tissue tends to move higher on the ML view because of the geometry of the projection relative to the midline of the chest. Therefore, the best answer is medial. Central would be near the nipple, posterior would be toward the chest wall, and lateral would be toward the outer portion of the breast; none of these align with the described upward shift on the ML view.

Two-view localization using MLO and ML relies on how tissue projects differently when viewed from oblique angles. The MLO view shows the breast from an oblique angle that emphasizes different regions than the ML (medial-lateral) view. When a lesion appears higher on the ML projection than it did on the MLO projection, that upward shift indicates the lesion lies toward the inner, or medial, portion of the breast. Medial tissue tends to move higher on the ML view because of the geometry of the projection relative to the midline of the chest.

Therefore, the best answer is medial. Central would be near the nipple, posterior would be toward the chest wall, and lateral would be toward the outer portion of the breast; none of these align with the described upward shift on the ML view.