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SEER Inquiry System - Report
Produced: 05/25/2026 11:25 AM
Question 20100010
Inquiry Details
References:
2007 SEER Manual, C-1060. Appendix C
Question:
MP/H Rules/Multiple primaries--Ovary: How many primaries are to be abstracted when a patient is diagnosed with serous cystadenocarcinoma [8441] of the right ovary and clear cell adenocarcinoma [8310] of the left ovary? See Discussion.
Discussion:
Patient had bilateral ovarian tumors. The right ovary had serous cystadenocarcinoma and left ovary had clear cell adenocarcinoma. The pathology COMMENT section stated, "Based on the histologic differences of the tumors within each ovary, feel these represent two distinct separate primaries. Lymph node metastases are clearly serous ca." The physician staged the right ovary as T2a N1 M0 and left ovary as T1c N0 M0. Do we accession one primary per rule M7 [Bilateral epithelial tumors (8000-8799) of the ovary within 60 days are a single primary]?
What is intention of Rule M7? If the histology in each ovary is different but within the range (8000-8799), is that supposed to be accessioned as one primary? Or is the intention of Rule M7 that tumors in both ovaries must have the SAME histology within that histology range to be a single primary?
Answer:
For cases diagnosed 2007 or later, apply rule M8 and abstract this case as multiple primaries.
Rule M7 does not apply when each ovary has a distinctly different histology, even when both histologies are with the specified code range. This clarification will be added to the next version of the rules.
