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Segmental Anatomy
Wendie A. Berg, MD, PhD, FACR, FSBI
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TERMINOLOGY

  • Definitions

    • Lobe (segment): Drainage territory defined by each major duct
      • Typically 12-16 or more lobes in each breast, each terminating in nipple orifice
    • Segmental distribution: Expected territory of duct and its branches with apex directed toward nipple
      • Can be seen as Ca⁺⁺, masses, or asymmetry on mammography, US
      • Mass or nonmass enhancement on MR
    • Terminal duct: Final branch of segmental duct
      • 2 parts: Extralobular terminal duct (ELTD) and intralobular terminal duct (ILTD)
    • Lobule: Composed of ILTD and complex system of tiny ducts terminating in blind-ending acini (alveoli)
    • Terminal duct lobular unit (TDLU): Lobule + ELTD

IMAGING ANATOMY

  • Lobe/Segment

    • Ductal System

      • Terminal Duct Lobular Unit

        CLINICAL IMPLICATIONS

        • Clinical Importance

          ANATOMY IMAGING ISSUES

          • Mammography

            • Ultrasound

              • MR

                Related Anatomy
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                References
                Tables

                Tables

                TERMINOLOGY

                • Definitions

                  • Lobe (segment): Drainage territory defined by each major duct
                    • Typically 12-16 or more lobes in each breast, each terminating in nipple orifice
                  • Segmental distribution: Expected territory of duct and its branches with apex directed toward nipple
                    • Can be seen as Ca⁺⁺, masses, or asymmetry on mammography, US
                    • Mass or nonmass enhancement on MR
                  • Terminal duct: Final branch of segmental duct
                    • 2 parts: Extralobular terminal duct (ELTD) and intralobular terminal duct (ILTD)
                  • Lobule: Composed of ILTD and complex system of tiny ducts terminating in blind-ending acini (alveoli)
                  • Terminal duct lobular unit (TDLU): Lobule + ELTD

                IMAGING ANATOMY

                • Lobe/Segment

                  • Ductal System

                    • Terminal Duct Lobular Unit

                      CLINICAL IMPLICATIONS

                      • Clinical Importance

                        ANATOMY IMAGING ISSUES

                        • Mammography

                          • Ultrasound

                            • MR