SEER Inquiry System - Question 20010168 Details

System Guide

Back to Search Results

SEER Inquiry System - Report

Produced: 09/14/2025 10:50 PM

Question 20010168

Export CSV Export PDF Print

Add to Report

Inquiry Details

References:

Question:

Histology (Pre-2007): What code is used to represent the histology "adenocarcinoma, undifferentiated, with sarcomatoid features"? See discussion.

Discussion:

Is the case more accurately coded with histology of adenosarcoma [8933/34] or adenocarcinoma, undifferentiated [8140/34]? Should "sarcomatoid" be interpreted as sarcoma?

Answer:

For tumors diagnosed prior to 2007:

Code the Histology field to 8140/34 [adenocarcinoma, undifferentiated]. Sarcomatoid means sarcoma-like and should not be used in coding histology.

For tumors diagnosed 2007 or later, refer to the MP/H rules. If there are still questions about how this type of tumor should be coded, submit a new question to SINQ and include the difficulties you are encountering in applying the MP/H rules.

Cancer Site Category:

N/A

Data Item Category:

Histology

Other Category:

N/A

Year:

2001