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SEER Inquiry System - Report
Produced: 09/20/2026 6:03 PM
Question 20091056
Inquiry Details
References:
#1: 2007 SEER Manual, C-1033, C-1052, C-1065. Appendix C
#2: WHO Class Female Genital Tumors, 114. 2003
Question:
MP/H Rules/Histology--Ovary: How is histology coded for an ovarian tumor diagnosed as an "ovarian clear cell cystadenocarcinoma"? See Discussion.
Discussion:
Final diagnosis for a resected ovary is ovarian clear cell cystadenocarcinoma. In applying the MP/H rules, rule H16 does not apply because cystadenocarcinoma is not included in Table 2. As a result rule H17 applies. Thus it appears the histology should be coded 8440. Cystadenocarcinoma is a specific histologic type and it is assigned the numerically higher histology code. This result differs from pre-2007 SINQ entry 20041045 that states: Code histology to 8310/3 [Clear cell adenocarcinoma, NOS]. This is consistent with the WHO Classification of Tumours and reflects the current practice of placing less emphasis on "cyst-" prefix for ovarian malignancies.
Answer:
For cases diagnosed 2007 or later:
Assign code 8310 [Clear cell adenocarcinoma] according to rule H13. Ignore "cyst" when determining the histologic type for ovarian malignancies. For this case, the only histology is clear cell.
The histologies for the common ovarian epithelial malignancies are serous, mucinous, endometrioid, clear cell, and transitional cell/Brenner. This clarification will be added to the rules in the next revision.
Cancer Site Category:
Ovary
Data Item Category:
Histology
Other Category:
N/A
Year:
2009
