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Level 1
- nodes lateral to pectoralis minor
- involved in 58% of Ca breast patients
Level 2
- nodes behind pectoralis minor
- Involved with level 1 in 22% of breast Ca patients
- 4-25% of patients had skip lesions
Level 3
- nodes medial to pectoralis minor
- nodal involvement occurs in <3-16% of patients
Use
- reduced recurrence rates after level 1and 2 clearance
- level 3 clearance adds little to reduce recurrence but increases morbidity
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