Oncocytoma Oxyphilic Adenoma

Introduction

• rare, benign tumor exclusively of oncocytic cells (1% of salivary gland tumors)

• rare "malignant" low-grade tumor transformation

• SSx: slow growing, painless mass

• Dx: surgical biopsy (parotidectomy), radiosialography (concentrates technetium-99m due to the presence of high mitochondrial content of oncocytes), FNA

• Rx: superficial or deep parotidectomy (see below)

Histopathology

• encapsulated

• oncocytic cells (see Warthin's tumor)

• granularity from mitochondria

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