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SEER Inquiry System - Report
Produced: 01/09/2026 8:33 PM
Question 20200036
Inquiry Details
References:
#1: WHO Class Skin Tumors, on-line version. 4th edition
#2: 2018 SEER Manual, 7. 1.b.i.
Question:
Reportability--Skin: Is malignant proliferative trichilemmal tumor (PTT) reportable, and if so, do we apply the matrix rule and code it to 8103/3? A literature search reveals these do exist, but are extremely rare.
Discussion:
Answer:
Malignant PTT (8103/3) of the skin is not reportable. A neoplasm originating in the skin with histology coded to 8103 is not reportable. See 1.b.i. on page 7 in the 2018 SEER manual for a complete list, https://seer.cancer.gov/manuals/2018/SPCSM_2018_maindoc.pdf
Cancer Site Category:
Skin
Data Item Category:
N/A
Other Category:
Reportability
Year:
2020
