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SEER Inquiry System - Report
Produced: 11/08/2025 5:23 PM
Question 20081100
Inquiry Details
References:
2007 SEER Manual, C-1064. Appendix C
Question:
MP/H Rules/Histology--Rectum: When not specifically mentioned as part of the histology, is the adenoma a second histologic type, or just a further physical description of the tumor? See Discussion.
Discussion:
Rectal tumor resection (APR) path report final dx: "mucinous carcinoma, see comment". The comment is the CAP-format tumor summary, which states "histologic type: adenocarcinoma with extensive mucin production (mucinous or colloid carcinoma). Additional pathologic findings: adenomas - tumor arises in a tubulovillous adenoma".
If you follow the rules and only use the final dx, you would code a different histology than if you use the 'additional path findings.'
Answer:
For cases diagnosed 2007 or later
Other Sites histology rule H12 applies in this case. Assign histology code 8263 [adenocarcinoma in tubulovillous adenoma].
Use information from the CAP protocol and from comments associated with the final diagnosis to code histology.
The fact that the malignancy arose in a polyp can be taken from anywhere in the medical record; not limited to the final diagnosis.
Based on the information provided for this case, the histology is adenocarcinoma with extensive mucin production (mucinous or colloid carcinoma) arising in a tubulovillous adenoma.
