Colon and Rectal Cancer

Stage 0: Tis N0 M0
Stage I: T1 N0 M0, T2 N0 M0
Stage IIA: T3 N0 M0
Stage IIB: T4 N0 M0
Stage IIIA: T1-T2 N1
Stage IIIB: T3-T4 N1 M0
Stage IIIC: Any T N2 M0
Stage IV: Any T Any N M1

click for more detailed layers of bowel wall
more pictures of stage levels here

go here for newest stage system 6th edition and 7th edition