Part of Cancer staging guidance sheets
Distal extrahepatic bile duct (ICD10 C24.0)
Introduction
This is the data sheet for TNM 9th edition staging of the distal extrahepatic bile duct (ICD10 C24.0)
For more detailed information regarding TNM staging, please see pages 91-92 of the UICC TNM 9 book.
Stage groupings
|
Stage Group |
T stage |
N stage |
M stage |
|---|---|---|---|
|
Stage 0 |
Tis |
N0 |
M0 |
|
Stage I |
T1 |
N0 |
M0 |
|
Stage IIA |
T1 |
N1 |
M0 |
|
|
T2 |
N0 |
M0 |
|
Stage IIB |
T2 |
N1 |
M0 |
|
|
T3 |
N0, N1 |
M0 |
|
Stage IIIA |
T1, T2, T3 |
N2 |
M0 |
|
Stage IIIB |
T4 |
Any N |
M0 |
|
Stage IV |
Any T |
Any N |
M1 |
TNM clinical classification
T - primary tumour
|
T value |
Description |
|---|---|
|
cTX |
Primary tumour cannot be assessed |
|
cT0 |
No evidence of primary tumour |
|
cTis |
Carcinoma in situ |
|
cT1 |
Tumour invades bile duct wall to a depth less than 5 mm |
|
cT2 |
Tumour invades bile duct wall to a depth of 5 mm up to 12 mm |
|
cT3 |
Tumour invades bile duct wall to a depth of more than 12 mm |
|
cT4 |
Tumour involves the coeliac axis, the superior mesenteric artery and/or the common hepatic artery |
N - regional lymph nodes
|
N value |
Description |
|---|---|
|
cNX |
Regional lymph nodes cannot be assessed |
|
cN0 |
No regional lymph node metastases |
|
cN1 |
Metastases to 1–3 regional nodes |
|
cN2 |
Metastasis to 4 or more regional nodes |
M - distant metastasis
|
M value |
Description |
|---|---|
|
cM0 |
No distant metastasis |
|
cM1 |
Distant metastasis |
TNM pathological classification
pT - primary tumour
The pT and pN categories correspond to the cT and cN categories as per above.
pN - regional lymph nodes
|
pN value |
Description |
|---|---|
|
pN0 |
Histological examination of a regional lymphadenectomy specimen will ordinarily include 12 or more lymph nodes. If the regional lymph nodes are negative, but the number ordinarily examined is not met, classify as pN0 |
Last edited: 16 January 2026 4:12 pm
