On biopsy, Warthin’s tumor is characterized by cystic spaces surrounded by two uniform rows of cells with centrally placed pyknotic nuclei, papillae with a two rows of pink epithelial cells, and lymphoid stroma.

Salivary gland biopsy is the most important test for diagnosis of Warthin’s tumor.

• The appearance of this tumor under the microscope is unique. There are cystic spaces surrounded by two uniform rows of cells with centrally placed pyknotic nuclei.
• The cystic spaces have epithelium referred to as papillary infoldings that protude into them. Additionally, the epithelium has lymphoid stroma with germinal center formation.
• Papillae (nipple-shaped structures) with a two rows of pink (eosinophilic) epithelial cells (with cuboidal basal cells and columnar luminal cells)
• Fibrous capsule – pink & homogenous on H&E stain
• Cystic space filled with debris in situ (not necrosis)
• Lymphoid stroma
• Additionally, the epithelium has lymphoid stroma with germinal center formation.^[1]

• 
  Histopathology of Warthin tumor in the parotid gland. H&E stain^[2]
• 
  Histopathology of Warthin tumor in the parotid gland. Another view of a file “Warthin tumor (1).jpg”. H&E stain..^[2]
• 
  Histopathology of Warthin tumor in the parotid gland. Higher magnification of a file “Warthin tumor (1).jpg”. H&E stain.^[2]
• 
  Histopathology of Warthin tumor in the parotid gland. Image courtesy of Nephron librepathology (original file ‘’here’’). Creative Commons BY­SA­NC
• 
  Histopathology of Warthin tumor in the parotid gland. Image courtesy of Nephron librepathology (original file ‘’here’’). Creative Commons BY­SA­NC
• 
  Histopathology of Warthin tumor in the parotid gland. Image courtesy of Nephron librepathology (original file ‘’here’’). Creative Commons BY­SA­NC
• 
  Histopathology of Warthin tumor in the parotid gland. Image courtesy of Nephron librepathology (original file ‘’here’’). Creative Commons BY­SA­NC