The classification applies only to gastrointestinal stromal tumours. There should be histological confirmation of the disease. The regional lymph nodes are those appropriate to the site of the primary tumour; see gastrointestinal sites for details.
GASTROINTESTINAL STROMAL TUMOURS (GIST)
Rules for Classification
Anatomical Sites and Subsites
Regional Lymph Nodes
TNM Clinical Classification
T – Primary Tumour
TX
Primary tumour cannot be assessed
T0
No evidence for primary tumour
T1
Tumour 2 cm or less in greater dimension (Fig. 319)
T2
Tumour more than 2 cm but not more than 5 cm (Fig. 319)
T3
Tumour more than 5 cm but not more than 10 cm (Fig. 320)
T4
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