1709 / 1983
involved mammary duct/lobule
Sigal-Zafrani et al.
Mod Pathol,
2004
Group 4
Minimal
involvement
≥1<15mm
Group 3
Focal
involvement
<1mm
Group 5
Extensive
involvement ≥15mm
Group 1
Margin close
>1mm
Group 2
Margin close
≤1mm
1 mm
DCIS: Margins width and focality