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SEER Inquiry System - Report
Produced: 02/05/2026 3:53 PM
Question 20220038
Inquiry Details
References:
#1: Solid Tumor Rules. Other Sites; September 2021 Update
#2: WHO Class Endocrine Tumors. 4th and 5th editions
Question:
Solid Tumor Rules/Histology--Thyroid: What is the histology code for sclerosing mucoepidermoid carcinoma with eosinophilla in the left thyroid and papillary thyroid carcinoma in the right thyroid? See Discussion.
Discussion:
The left thyroid lobectomy/isthmusectomy returned a diagnosis of sclerosing mucoepidermoid carcinoma with eosinophina, 6.5 cm, replacing nearly the entire left lobe of the thyroid.
The patient has a completion thyroidectomy of the right lobe and returned the diagnosis of papillary thyroid carcinoma, 0.5 mm, in maximum dimension.
The endocrinologist describes it as "co-exsisting" and states the tumor is iodine non-avid.
Answer:
Abstract two primaries and assign code 8260/3 (papillary adenocarcinoma, NOS) to the right thyroid using Solid Tumor Rules, Other Sites, Rule H14, and 8430/3 (mucoepidermoid carcinoma) to the left thyroid as these are separate tumors with different histology types according to WHO Classification of Tumors of Endocrine Organs, 4th edition.
