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Is a rectal carcinoma that extends into the anus a T3 or a T4?

April 26, 2017carcinoma extends Rectal T3 T4

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Is a rectal carcinoma that extends into the anus a T3 or a T4?

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The TNM Supplement states that: “Intramural direct extension from one subsite (segment) of the colon to an adjacent one is not considered in the T classification. The same applies to intramural direct extension from the rectum to the anal canal”. The T category is determined by the depth of penetration.