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SEER Inquiry System - Report
Produced: 07/19/2025 8:59 PM
Question 20160013
Inquiry Details
References:
#1: WHO Class Breast Tumors
#2: Glossary for Registrars
Question:
Reportability--Breast: Is mammary fibromatosis reportable and if so, what histology code is assigned? See discussion.
Discussion:
The pathologist completed a CAP protocol using soft tissue. Pathology revealed a 2.5 cm tumor with invasion of skeletal muscle with deep margins positive for tumor.
Answer:
Mammary fibromatosis is not reportable. The WHO classification for breast tumors assigns mammary fibromatosis a behavior code of /1. According to WHO, mammary fibromatosis "is a locally infiltrative lesion without metastatic potential…"
Cancer Site Category:
Breast
Data Item Category:
N/A
Other Category:
Reportability
Year:
2016
