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SEER Inquiry System - Report
Produced: 07/24/2025 2:37 AM
Question 20100013
Inquiry Details
References:
#1: Heme & Lymph Manual & DB, Case Reportability Instructions & Glossary, 1
#2: ICD-O-3
Question:
Reportability--Lymphoma: Should a December 2008 diagnosis of in situ follicular lymphoma be accessioned? See Discussion.
Discussion:
Patient with mesenteric lymphadenopathy had a biopsy. Consult supports original pathology findings: The histologic and immunophenotypic findings represent what has been referred to in the literature as "in situ follicular lymphoma." The oncology assessment states, "At this point the patient has no other obvious evidence of other disease. ...no hepatosplenomegaly...no peripheral adenopathy...no significant abnormalities on PET scan to suggest active lymphoma." No treatment is planned at this time. The patient will only be monitored.
Answer:
Do not report in situ lymphoma at this time. Currently, lymphoma cannot be reported with a behavior code of in situ (/2) and it would be incorrect to abstract in situ lymphoma as a /3.
It is true that this is a recently identified pathologic entity. Our experts say that there is still some controversy to be ironed out regarding the criteria for identifying an in situ lymphoma. Their recommendation was to wait until clear guidelines had been established for the pathologists before we start collection of in situ lymphomas. We anticipate collecting these entities in the future.
