T= Primary Tumor        N= Regional Tumor        M= Distant Metastasis
PRIMARY TUMOR (T)

TX    Primary tumor cannot be asssessed
TO    No evidence of primary tumor
Tis*  Carcinoma in situ: Intraductal carcinoma,  lobular carcinoma inn situ,  or Paget's disease of the nipple
          with no tumor
T1     Tumor 2 cm or less in greatest dimension
T2     Tumor more than 2 cm but not more than 5 cm in greatest dimension
T3     Tumor more than 5 cm in greatest dimension
T4     Tumor of any size with direct extension to chest wall or skin

*NOTE: Paget's disease associated with a tumor is classified  according to the size of the tumor.
  NOTE: Chest wall includes ribs,  intercostal muscles,  and serratus anterior muscle but not pectoral muscle. 

REGIONAL LYMPH     
NODES (N)(CLINICAL)        Next Page