APPENDIX (67181)    ICDO TOPOGRAPHY (164)

• T-CODE:   X
• T-CODE:   IS
• T-CODE:   4A
• T-CODE:   4B

Primary Tumor (T)
       mesoappendix
T4   Tumor penetrates visceral peritoneum, including mucinous peritoneal
       tumor within the right lower quadrant and/or directly invades other
       organs or structures
T4a  Tumor penetrates visceral peritoneum, including mucinous peritoneal
       tumor within the right lower quadrant
T4b  Tumor directly invades other organs or structures
 
Carcinoma
TX   Primary tumor cannot be assessed
T0   No evidence of primary tumor
Tis  Carcinoma in situ: intraepithelial or invasion of lamina propria *
T1   Tumor invades submucosa
T2   Tumor invades muscularis propria
T3   Tumor invades through muscularis propria into subserosa or into 

• N-CODE:   X

Regional Lymph Nodes (N)
 
Carcinoma
NX  Regional lymph nodes cannot be assessed
N0  No regional lymph node metastasis
N1  Metastasis in 1 to 3 regional lymph nodes
N2  Metastasis in 4 or more regional lymph nodes

• M-CODE:   1A
• M-CODE:   1B

Distant Metastasis (M)
 
Carcinoma
M0   No distant metastasis
M1a  Intraperitoneal metastasis beyond the right lower quadrant, including
       pseudomyxoma peritonei
M1b  Non-peritoneal metastasis