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National Program of Cancer Registries - page 40 / 93

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Coding Behavior for Colon/Rectum

  • Synonyms for in situ, behavior code 2

    • Intraepithelial

    • Noninvasive

  • Intramucosal is not in situ behavior

    • Tis for AJCC stage

    • Local for SS77 and SS2000

    • Behavior code 3 for ICD-O-3 histology code

For colon/rectum, intraepithelial and noninvasive are synonyms for in situ. Tumors described histologically as intraepithelial or noninvasive should be coded with ICD- O-3 behavior code 2 (in situ). Even though tumors described as intramucosal are categorized in AJCC stage as Tis, the ICD-O-3 behavior is not in situ (2). Intramucosal is not a synonym for in situ. The behavior code for intramucosal tumors of the colon and rectum is malignant (3), and the stage for SS77 and SS2000 is local.

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