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SEER Inquiry System - Report
Produced: 12/16/2025 2:46 PM
Question 20150048
Inquiry Details
References:
#1: WHO Class Skin Tumors, 13. 2006
#2: 2015 SEER Manual, 11
Question:
Reportability--Skin: Is low grade trichoblastic carcinoma, with a small focus of high grade carcinoma of the scalp reportable? See discussion.
Discussion:
Pathology report states: the individual nodules of trichoblastic cells resemble those seen in trichoblastoma, but the lesion is very poorly circumscribed with an infiltrative border that extends into the subcutis. the lesion may behave in a locally aggressive fashion, and should be completely removed. High grade trichoblastic carcinomas can metastasize.
Answer:
Trichoblastic carcinoma of the skin is not reportable. The WHO classification lists trichoblastic carcinoma as a synonym for basal cell carcinoma, 8090/3. Basal cell carcinoma of the skin is not reportable. See page 11 in the SEER manual, http://seer.cancer.gov/manuals/2015/SPCSM_2015_maindoc.pdf.
