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→Staging: +Image
Stage by the TNM system as follows in sections below.
Also, look for any angiolymphatic invasion. If present, check whether it reaches outside the tumor, and if so, how far.<ref name=Stanford>{{cite web|url=http://surgpathcriteria.stanford.edu/breast/infductcabr/grading.html|title=Infiltrating Ductal Carcinoma of the Breast (Carcinoma of No Special Type)|website=Stanford Medical School|accessdate=2019-10-02}}</ref> Give greatest dimension {{Moderate-begin}},or 3 dimensions or greatest dimension, generally by adding up the estimated thicknesses of involved slices{{Comprehensive-end}}.<ref name=Stanford/>
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*TX: inability to assess that site
*Tis: [[ductal carcinoma in situ]] (DCIS), [[lobular carcinoma in situ]] (LCIS) or [[Paget's disease of the breast]]
[[File:Measurement of tumor size on two microscopy slides.jpg|thumb|220px|Measurements can be made by marking the tumor on microscopy, and then measuring between the markings, which may overlap between multiple slides as shown.]]
*T1: Less than 2 cm
:*T1a: 0.1 to 0.5 cm
