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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
- Lobe (segment): Drainage territory defined by each major duct
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
- Lobe (segment): Drainage territory defined by each major duct
IMAGING ANATOMY
Lobe/Segment
Ductal System
Terminal Duct Lobular Unit
CLINICAL IMPLICATIONS
Clinical Importance
ANATOMY IMAGING ISSUES
Mammography
Ultrasound
MR
