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Gastrointestinal Carcinoid Tumors Treatment (PDQ®)

  • Updated: 07/31/2014

Table 5. Primary Tumor (T)a

TXPrimary tumor cannot be assessed.
T0No evidence of primary tumor.
T1Tumor invades lamina propria or submucosa and size ≤1 cmb (small intestinal tumors); tumor ≤1 cm (ampullary tumors).
T2Tumor invades muscularis propria or size >1 cm (small intestinal tumors); tumor >1 cm (ampullary tumors).
T3Tumor invades through the muscularis propria into subserosal tissue without penetration of overlying serosa (jejunal or ileal tumors) or invades pancreas or retroperitoneum (ampullary or duodenal tumors) or into nonperitonealized tissues.
T4Tumor invades visceral peritoneum (serosa) or invades other organs.
For any T, add (m) for multiple tumors.

aReprinted with permission from AJCC: Neuroendocrine tumors. In: Edge SB, Byrd DR, Compton CC, et al., eds.: AJCC Cancer Staging Manual. 7th ed. New York, NY: Springer, 2010, pp 181-9.
bTumor limited to ampulla of Vater for ampullary gangiocytic paraganglioma.