Title

Primary Parotid Tumor Thrombosis: Immunohistologic Features and Awareness of Metastatic Potential

Document Type

Conference Proceeding

Publication Date

8-2021

Publication Title

American Journal of Dermatopathology

Abstract

Introduction: Tumor thrombosis is a poor prognostic feature and is exceptionally rare in salivary gland malignancies.

Methods: We identified a case of primary parotid epithelial-myoepithelial carcinoma (EMC) with tumor thrombosis.

Results: An 82-year old male presented with a complaint of a right facial mass. Imaging demonstrated a mass of the right parotid gland with attenuation of the right external jugular vein (EJV). The patient underwent right parotidectomy and selective neck dissection. Tumor thrombosis was found intraoperatively within the EJV. Final pathology demonstrated a poorly differentiated EMC. The tumor was positive for CK5/6, p16, p40, SOX10, smooth muscle actin, myosin, and synaptophysin, but negative for INSM1, NUT, S100, ERG, and uroplakin. Adjuvant radiation therapy was administered. Three months later, imaging revealed numerous bilateral pulmonary nodules with biopsy demonstrating poorly differentiated EMC without locoregional relapse.

Conclusions: Primary parotid tumor thrombosis is rare and carries a poor prognosis. The use of early systemic therapy should be investigated.

Volume

43

Issue

Supplement

First Page

1

Comments

Poster Abstract presented at the 24th Virtual Joint Meeting of The International Society of Dermatopathology, April 12-16, 2021.

Last Page

14

Share

COinS