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Produced: 10/15/2025 1:54 PM
Question 20100029
Inquiry Details
References:
2010 SEER Manual. Appendix C
Question:
MP/H Rules/Histology--Corpus uteri: How should histology be coded and how many primaries should be accessioned for an endometrial primary in which curettings showed malignant mixed mullerian tumor (carcinosarcoma) but hysterectomy specimen showed endometrioid adencarcinoma? See Discussion.
Discussion:
The pathology report COMMENT for the hysterectomy specimen stated that the previous curettage was reviewed. The findings are compatible with malignant mixed mullerian tumor. No residual features of malignant mixed mullerian tumor are found in the current resection, which shows FIGO grade I adenocarcinoma in the wall of the uterus. The malignant mixed Mullerian tumor appears to have been removed with the curettage. There is no information available regarding the number of tumors in these specimens.
Answer:
For cases diagnosed 2007 or later, abstract a single primary. Rule M1 applies because there is no information on the number of tumors and there is no way to know whether the curettage sample was from a separate tumor or from the tumor in the hysterectomy specimen.
Apply rule H17 and code histology to 8980/3 for malignant mixed Mullerian tumor [Carcinosarcoma, NOS].
Cancer Site Category:
Corpus uteri
Data Item Category:
Histology
Other Category:
N/A
Year:
2010
