• Breast density
  • Fat : glandular
  • Pre-menopausal tend to have more glandular tissue (general, but not absolute. 20% never really loss it)

Region Anatomy

Blood Supply

Artery

Vein

Lymph

• 75% Axillary
• Abdominal/superficial inguinal nodes
• Parasternal nodes

Axillary LN

Level 1 -> 2 -> 3

I → III, superficial to deep

• Level I: lateral to the lateral border of the pectoralis minor muscle
• Level II: posterior to the pectoralis minor muscle