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SEER Inquiry System - Report
Produced: 12/29/2025 7:21 PM
Question 20140083
Inquiry Details
References:
2007 MP/H Rules. Other sites
Question:
MP/H Rules/Multiple primaries--Thyroid: How many primaries should be reported when a complete thyroidectomy specimen shows two tumors: 1.8 cm papillary carcinoma with tall cell features (8344/3) and a 0.4 cm papillary thyroid carcinoma (8260/3)? See discussion.
Discussion:
Is papillary thyroid carcinoma an NOS histology qualifying for rule M16, thus leading to a single primary, or would M17 apply (multiple primaries) because the histology codes are different at the second digit (8260 and 8344)? While rule M16 doesn't include papillary thyroid carcinoma in the listed histologies, it seems like it may be an NOS histology for the thyroid. In addition, code 8260/3 is listed as NOS in the ICD-O-3.
Answer:
Apply rule M16 and abstract a single primary. These two thyroid tumors, one papillary carcinoma with tall cell features (8344/3) and one papillary thyroid carcinoma, fit the criteria for rule M16, although not explicity listed there. We will clarify this in the next version of the rules.
