Editing Foregut NET (section)

== Staging ==

* See 'pancreatic NETs' topic


Staging duodenal/ampulla of Vater NENs
{| class="wikitable"
|'''Primary tumor (T)'''
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|'''T category'''
|'''T criteria'''
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|TX
|Primary tumor cannot be assessed
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|T1
|Tumor invades the mucosa or submucosa only and is ≤1 cm (duodenal tumors).

Tumor ≤1 cm and confined within the sphincter of Oddi (ampullary tumors).
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|T2
|Tumor invades the muscularis propria or is >1 cm (duodenal).

Tumor invades through sphincter into duodenal submucosa or muscularis propria, or is >1 cm (ampullary).
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|T3
|Tumor invades the pancreas or peripancreatic adipose tissue
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|T4
|Tumor invades the visceral peritoneum (serosa) or other organs
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|''NOTE:'' Multiple tumors should be designated as such (and the largest tumor should be used to assign the T category):

* If the number of tumors is known, use T(#); eg, pT3(4) N0 M0.
* If the number of tumors is unavailable or too numerous, use the m suffix, T(m); eg, pT3(m) N0 M0.
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|'''Regional lymph nodes (N)'''
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|'''N category'''
|'''N criteria'''
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|NX
|Regional lymph nodes cannot be assessed
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|N0
|No regional lymph node involvement
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|N1
|Regional lymph node involvement
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|'''Distant metastasis (M)'''
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|'''M category'''
|'''M criteria'''
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|M0
|No distant metastasis
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|M1
|Distant metastases
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|M1a
|Metastasis confined to liver
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|M1b
|Metastases in at least one extrahepatic site (eg, lung, ovary, nonregional lymph node, peritoneum, bone)
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|M1c
|Both hepatic and extrahepatic metastases
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|'''Prognostic stage groups'''
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|'''When T is...'''
|'''And N is...'''
|'''And M is...'''
|'''Then the stage group is...'''
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|T1
|N0
|M0
|I
|-
|T2
|N0
|M0
|II
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|T3
|N0
|M0
|II
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|T4
|N0
|M0
|III
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|Any T
|N1
|M0
|III
|-
|Any T
|Any N
|M1
|IV
|}