Warthin’s Tumour

• A Warthin’s Tumour, also known as Papillary Cystadenoma Lymphomatosum, is the second most common benign salivary gland tumour after a pleomorphic adenoma.¹
• It occurs almost exclusively in the parotid gland, can be bilateral in around 10% of patients, and is more commonly seen in smokers.

Pathologic Features

• On microscopy, a Warthin’s Tumour is characterized by a bilayered oncocytic epithelium arranged in papillary structures, with or without cystic spaces.²
• Beneath the oncocytic epithelium is a dense lymphoid stroma
• This combination of a bilayered oncocytic epithelium and a lymphoid stroma is classic for a Warthin’s tumour.