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SEER Inquiry System - Report
Produced: 10/08/2025 9:12 AM
Question 20130100
Inquiry Details
References:
Heme & Lymph Manual & DB
Question:
Multiple primaries/Primary site--Heme & Lymphoid Neoplasms: How many primaries are there and how should I code the primary site(s)? See discussion.
Discussion:
Patient had a hemicolectomy and a salpingo-oophorectomy and was found to have diffuse large B cell lymphoma in the colon (10 cm cecal mass), 3/16 regional lymph nodes involved with lymphoma. Fallopian tube showed involvement with diffuse large B Cell lymphoma.
Multiple primaries - Colon and fallopian tube?
One primary - Colon? Stage IV, or lymphoma from an unknown primary? Note: There were no other lymph nodes involved.
Answer:
Use Rule M2. Abstract as a single primary when there is a single histology.
When you have questions about how to code the primary site, start with the abstractor notes. If the answer isn't found there go to Module 7 (a specific module to help code primary site for lymphomas).
The abstractor notes for DLBCL in this case do not provide information you can use for this case. Go to Module 7 in the PH rules.
Use Rule PH25 Code the primary site to the organ when lymphoma is present in an organ and that organ’s regional lymph nodes. Code the primary site to colon (organ and regional lymph nodes involved). The fallopian tube is secondary involvement. As is common with lymphomas, there can be more than one organ involved. You can differentiate the primary site from the secondary site(s) because of the large colon mass with regional lymph node involvement.
