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SEER Inquiry System - Report
Produced: 11/24/2024 5:58 PM
Question 20110071
Inquiry Details
References:
Subject matter expert
Question:
Discussion:
The patient underwent a resection of a perineal mass. Per review of slides it was stated to be "primary mucinous adenocarcinoma arising in a chronic perianal fistula." The adenocarcinoma was invasive into the dermal connective tissue and skeletal muscle, but there was no extension into the anal canal. The discharge diagnosis from the reporting facility called this adenocarcinoma of "ectopic rectal tissue in perianal area."
Should the primary site be coded to skin based on the dermal involvement and lack of anal or rectal involvement? Or, should the primary site be coded to rectum based on the physician's assessment that this adenocarcinoma arose in ectopic rectal tissue?
Answer:
For cases diagnosed 2007-2014:
Code the Primary Site field to C210 [Anus, NOS]. This is an unusual and rare presentation. According to our expert pathologist, "There is no ideal site code [for] this case. I would code to C210. In this location it can at least be located by anyone who wants to get a look at such lesions. Because of the unusual location of this tumor, I would like to be able to code it to perineum, but it will be totally lost in those site codes as they represent extensive areas beyond perianal (skin of trunk, soft tissue of pelvis, and pelvis, respectively)... I would not code to rectum [because it would be] lost among too many primary rectal carcinomas."
