| 0 |
**In situ, intraepithelial, noninvasive**
* In situ: noninfiltrating; intraepithelial
* Intraductal WITHOUT infiltration
* Lobular neoplasia, grade 3 (LIN 3)
* Paget disease, in situ |
| 1 |
**Localized only (localized, NOS)**
* Confined to breast tissue and fat including nipple and/or areola
* Paget disease WITH or WITHOUT underlying tumor |
| 2 |
**Regional by direct extension only**
* Attachment or fixation to pectoral muscle(s) or underlying tumor
* Chest wall
* Deep fixation
* Extensive skin involvement WITH or WITHOUT dermal lymphatic filtration
- Edema of skin
- En cuirasse
- Erythema
- Inflammation of skin
- Lenticular nodule(s)
- Peau d'orange ("pigskin")
- Satellite nodules
- Skin edema
- Ulceration of skin of breast
* Inflammatory carcinoma, NOS
* Intercostal or serratus anterior muscle(s)
* Ipsilateral rib(s) (contiguous extension only, for discontiguous extension, see code 7)
* Local infiltration of dermal lymphatics adjacent to primary tumor involving skin by direct extension
* Pectoral fascia or muscle(s)
* Subcutaneous tissue
* Skin infiltration of primary breast including skin of nipple and/or areola |
| 3 |
**Regional lymph node(s) involved only**
* Axillary, NOS (ipsilateral)
- Level I (low-axilla) (low) (superficial), NOS [adjacent to tail of breast]
+ Anterior (pectoral)
+ Lateral (brachial)
+ Posterior (subscapular)
- Level II (mid-axilla) (central), NOS
+ Interpectoral (Rotter's)
- Level III (high) (deep), NOS
+ Apical (subclavian)
+ Axillary vein
* Fixed/matted axillary (ipsilateral)
* Infraclavicular (subclavicular) (ipsilateral)
* Internal mammary (parasternal) (ipsilateral)
* Intramammary (ipsilateral)
* Regional lymph node(s), NOS
- Lymph node(s), NOS |
| 4 |
**Regional by BOTH direct extension AND regional lymph node(s) involved**
* Codes (2) + (3) |
| 7 |
**Distant site(s)/lymph node(s) involved**
* Distant site(s) (including further contiguous extension)
- Adrenal (suprarenal) gland
- Bone, including contralateral ribs
- Contralateral (opposite) breast-if stated as metastatic
- Ipsilateral rib(s) (discontiguous extension only, see code 2 for contiguous extension)
- Lung
- Ovary
- Satellite nodule(s) in skin other than primary breast
- Skin over
+ Axilla
+ Contralateral (opposite) breast
+ Sternum
+ Upper abdomen
* Distant lymph node(s), NOS
- Axillary (contralateral or bilateral)
- Cervical, NOS
- Fixed/matted axillary (level I and II) (contralateral or bilateral)
- Infraclavicular (subclavicular) (contralateral or bilateral)
- Internal mammary (parasternal) (contralateral or bilateral)
- Intramammary (parasternal) (contralateral or bilateral)
- Supraclavicular (transverse cervical) (ipsilateral, contralateral or bilateral)
* Distant metastasis, NOS
- Carcinomatosis
- Distant metastasis WITH or WITHOUT distant lymph node(s) |
| 9 |
Unknown if extension or metastasis |
