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SEER Inquiry System - Report
Produced: 06/17/2026 12:08 AM
Question 20240030
Inquiry Details
References:
#1: ICD-O-3.2
#2: Subject matter expert
Question:
Reportability/Primary Site--Skin: Is squamous cell carcinoma (SCC) that overlaps skin and the vermillion border reportable when the percent of overlap is unknown? See Discussion.
Discussion:
SINQ 20031110 addresses an overlapping lip lesion between skin and the vermillion border. We were instructed to go with area of greatest involvement. Case would be reportable if >50% of tumor was on the vermillion border and site would be coded to vermillion border (C00._). Often times percentage of involvement is not stated and all that is known is that the lesion overlaps skin and mucosa.
Answer:
Determine whether the lesion is on the mucosa or skin based on the pathology report, history and physical, and operative notes when available. The gross description of the pathology report should include information to help in determining whether the site of origin is epithelium (skin) or mucosa (lip).
Do not report the case when the site of origin cannot be determined between a reportable site and non-reportable site for this histology. This includes situations where the site of origin or the site with the greatest involvement is undetermined. In this case, you cannot confirm reportability.
