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SEER Inquiry System - Report
Produced: 04/19/2025 2:56 PM
Question 20220026
Inquiry Details
References:
#1: WHO Class H & N Tumors, online. 5th edition
#2: Solid Tumor Rules. Head and Neck
Question:
Solid Tumor Rules/Histology--Parotid: How is histology coded for a myoepithelial carcinoma ex-pleomorphic adenoma of the parotid?
Discussion:
Patient has a 2021 left parotidectomy showing myoepithelial carcinoma ex-pleomorphic adenoma. Is this coded to myoepithelial carcinoma (8982/3) or carcinoma ex-pleomorphic adenoma (8941/3)? It is unclear how to arrive at the correct histology code using the current Solid Tumor Rules.
Answer:
Code myoepithelial carcinoma ex pleomorphic adenoma as carcinoma ex pleomorphic adenoma (CXPA) (8941/3) using Head and Neck Solid Tumor Rule H1 as this is a single histology. The WHO Classification of Head and Neck Tumors, 5th ed., describes CXPA as a rare epithelial and/or myoepithelial malignance arising in association with a primary or recurrent pleomorphic adenoma. The histologic type of the carcinoma component is usually recorded, in this case, myoepithelial carcinoma.
