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SEER Inquiry System - Report
Produced: 02/04/2026 5:32 PM
Question 20240013
Inquiry Details
References:
#1: Solid Tumor Rules. Other Sites, May 2023 update
#2: WHO Class Urinary System and Male Genital Organs, 281-283. 5th edition
Question:
Solid Tumor Rules/Histology--Testis: Can a definition for "teratoma with somatic-type malignancy" (9084) be added to the Other Sites Solid Tumor Rules? See Discussion.
Discussion:
We included this histology in SEER Workshop Case 12 and the histology coding accuracy was less than 40%. From emails we received, it is clear that registrars are unaware that the "somatic type malignancy" can vary but code 9084 applies when the diagnosis is teratoma WITH any non-germ cell tumor component. It may be helpful to add a definition for "teratoma with somatic-type malignancy" (9084) to the Solid Tumor Manual.
Answer:
We will add the same definition for teratoma with malignant transformation found in the ovary table: 9084/3 Teratoma with malignant transformation when a malignant (/3) histology arises in a benign teratoma.
Teratoma with malignant transformation and teratoma with somatic-type malignancy are synonoyms. The term teratoma with somatic-type malignancy is outdated and no longer recommended.
