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SEER Inquiry System - Report
Produced: 10/15/2025 10:04 PM
Question 20091003
Inquiry Details
References:
#1: ICD-O-3
#2: 2007 SEER Manual, C-1064, 80. Appendix C
Question:
MP/H Rules/Histology--Peritoneal primary: Can the cell types from the primary site and a metastatic site be combined to code histology? See Discussion.
Discussion:
Patient has vaginal mass biopsy diagnosed as 'papillary carcinoma with psammoma bodies.' Two weeks later the patient has laparoscopy with multiple peritoneal biopsies, diagnosed as 'well differentiated serous adenocarcinoma'. Patient stated to have peritoneal primary with mets to vagina and was treated with chemotherapy. Do we code the histology to 8441/31 from the primary site biopsies, or can we use 8460/3, combining the cell types from the primary and metastatic sites? Please see SINQ 20041062 for a similar question before the 2007 MP/H rules.
Answer:
For cases diagnosed 2007 or later, assign code 8441 [serous adenocarcinoma, NOS].
Code the histology from the primary site when available. Do not combine histologies from primary and metastatic sites.
In this primary peritoneal case, the diagnosis from the peritoneal biopsies was serous adenocarcinoma.
Cancer Site Category:
N/A
Data Item Category:
Histology
Other Category:
N/A
Year:
2009
