A Case of Mucosa-Associated Lymphoid Tissue Lymphoma Occurring in the Bilateral Accessory Parotid and Parotid Glands Presenting as Infra-Zygomatic Masses

Abstract

Neoplasm from the accessory parotid glands (APG) rarely occurs, and its malignancy rate is higher than other salivary glands. The B-cell lymphoma from APG is rare, with less than 2% of all malignancy in APG. The mucosa-associated lymphoid tissue (MALT) lymphoma, a subtype of B-cell lymphoma, tends to be a localized disease with an indolent clinical course. It is very rare for MALT lymphoma to develop bilaterally in the APG and the parotid glands without an autoimmune disease. A 43-year-old male presented with superficial masses in the bilateral infra-zygomatic regions, and was pathologically confirmed as MALT lymphoma by excisional biopsy. We report this very rare and interesting case with a brief literature review.