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Published in: Head and Neck Pathology 4/2023

13-10-2023 | Androgens | Case Report

Salivary Duct Carcinoma Arising in a Warthin Tumor of the Parotid Gland: A Rare Case Report with Review of Literature and PD-L1 Expression

Authors: Kaitlyn J. Nielson, Gamaliel Lorenzo, Shweta Agarwal

Published in: Head and Neck Pathology | Issue 4/2023

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Abstract

Warthin’s tumor is the second most common neoplasm of the parotid gland and consists of 2 components, including lymphoid stroma and glandular epithelium. Malignant transformation in this tumor is mostly seen in the lymphoid component; however, the carcinomatous transformation of the epithelial component is extremely rare. Cases of latter reported in the literature include squamous cell carcinoma, adenocarcinoma, mucoepidermoid carcinoma, oncocytic carcinoma, Merkel cell carcinoma, and undifferentiated carcinoma. We describe an extremely rare case of salivary duct carcinoma arising in a Warthin tumor in a 64-year-old male. Patient presented with an enlarging left parotid mass, biopsy of which showed salivary duct carcinoma. He subsequently underwent left parotidectomy along with left level II–IV lymph node dissection. Histology revealed both in situ as well as invasive salivary duct carcinoma arising from Warthin tumor. Immunohistochemistry showed tumor cells positive for CK7, AR, and GATA3, while p63 highlighted the myoepithelial cell layer in the in situ component. Her2 was 2+ by immunohistochemistry. In addition, PD-L1 IHC revealed positive expression with a combined positive score of 20%.
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Metadata
Title
Salivary Duct Carcinoma Arising in a Warthin Tumor of the Parotid Gland: A Rare Case Report with Review of Literature and PD-L1 Expression
Authors
Kaitlyn J. Nielson
Gamaliel Lorenzo
Shweta Agarwal
Publication date
13-10-2023
Publisher
Springer US
Keyword
Androgens
Published in
Head and Neck Pathology / Issue 4/2023
Electronic ISSN: 1936-0568
DOI
https://doi.org/10.1007/s12105-023-01587-1

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