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SEER Inquiry System - Report
Produced: 11/05/2025 3:39 AM
Question 20081041
Inquiry Details
References:
2007 SEER Manual, C-1059. Appendix C
Question:
MP/H Rules/Histology--Thyroid: How many primaries are to be reported and what histology is to be coded for an anaplastic/undifferentiated thyroid carcinoma with sarcomatoid transformation likely arising in association with a papillary thyroid carcinoma? Thyroid contains one tumor: 12.5 cm in greatest dimension...almost completely replaces entire thryroid gland.
Discussion:
Answer:
For cases diagnosed 2007 or later:
This is a single primary using rule M2; a single tumor is always a single primary.
The histology code for this case is 8260/3 [Papillary carcinoma of thyroid]. Begin with Histology Coding rule H8. Stop at rule H17 and code the histology with the numerically higher ICD-O-3 code.
Cancer Site Category:
Thyroid
Data Item Category:
Histology
Other Category:
N/A
Year:
2008
