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SEER Inquiry System - Report
Produced: 10/31/2025 7:13 PM
Question 20130149
Inquiry Details
References:
#1: WHO Class Male Genital Tumors
#2: 2007 MP/H Rules
Question:
Discussion:
The right orchiectomy specimen showed a mixed histology tumor. The retroperitoneal lymph nodes showed teratoma, NOS only. Does the presence of teratoma in the lymph nodes change the histology coding?
The MP/H Rules for Other Sites, Table 2 (Mixed and Combination Codes) does not include the combination of embryonal carcinoma, yolk sac tumor and seminoma. SINQ 20110013 does state the combination of embryonal carcinoma and yolk sac tumor should be coded to histology 9065/3 [germ cell tumor, nonseminomatous]. In this case, is the focus of seminoma comprising <1% included when coding the histology? If the seminoma is included, Table 2 still does not address this combination.
Answer:
Code the histology to mixed germ cell tumor [9085/3] per Rule H16; code the appropriate combination/mixed code when there are multiple specific histologies.
According to the WHO Classification of Tumors of the Male Genital Organs, tumors of more than one histologic type (mixed forms) can occur in any combination of various germ cell histologies including embryonal, yolk sac, teratoma, and choriocarcinoma. Mixed teratoma and seminoma is included under histology code 9085/3 [mixed germ cell tumor] in the ICD-O-3. The revised MP/H rules will expand on these mixed testicular histologies.
Priority for coding histology is using the diagnosis from the primary site (when possible) over the histology from a metastatic site. The presence of teratoma, NOS in the retroperitoneal lymph nodes does not change the histology code.
