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SEER Inquiry System - Report
Produced: 04/17/2026 7:22 PM
Question 20260011
Inquiry Details
References:
#1: WHO Class Breast Tumors, online. 5th edition, Breast
#2: 2026 SEER Manual, 13-17. Reportability
Question:
Reportability/Histology--Breast: 2026: Is lobular neoplasia (atypical lobular hyperplasia) reportable? There is no mention of grade and or conclusive lobular carcinoma in situ (LCIS) statement given.
Discussion:
Answer:
Do not report a case of atypical lobular hyperplasia of the breast until/unless it is definitively diagnosed as LCIS or another reportable neoplasm. WHO defines this as a non-invasive lobular neoplasia. Atypical lobular hyperplasia does not have an ICD-O code and is not equivalent to in situ.
Cancer Site Category:
Breast
Data Item Category:
Histology
Other Category:
Reportability
Year:
2026
