Warthin's tumor pathophysiology

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Ammu Susheela, M.D. [2] Nazia Fuad M.D.

Overview

Warthin's tumor arises from salivary gland epithelium, which are secretory cells of the salivary gland. On gross pathology, cystic and multicentric appearance are characteristic findings of Warthin's tumor. On microscopic histopathological analysis, papillae, fibrous capsule, and cystic spaces are characteristic findings of Warthin's tumor.

Pathogenesis

• Warthin tumor (or papillary cystadenoma lymphomatous) is a benign, sharply demarcated tumor of the salivary gland. It is bilateral in 10-15% of cases.
• The gland most likely affected is the parotid gland. In fact, it is the only tumor virtually restricted to the parotid gland.
• Though much less likely to occur than pleomorphic adenoma, Warthin's tumor is the second most common benign parotid tumor.
• The first symptom is usually a painless, slow-growing bump in front of the ear, on the bottom of the mouth, or under the chin.
• The tumor is slow growing, painless, and usually appears in the tail of the parotid gland near the angle of the mandible.
• In 5–14% of cases, Warthin's tumor is bilateral, but the two masses usually are at different times.
• Warthin's tumor is highly unlikely to become malignant.

Genetics

• Expression of CRTC1 - MAML2 chimeric genes through t(11;19)(q21;p13) translocation is involved in the pathogenesis of Warthin's tumor.

Gross Pathology

• Warthin's tumor is often multicentric (20%) and is usually small (1-4 cm). It has typically heterogeneous appearance on all modalities, often with cystic components (30%).
• The size of Warthin's tumor is usually 2.5 centimeter.
• Warthin's tumor tend to favor the parotid tail region.

Microscopic Pathology

• 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) - key feature
• 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.

• 
  Histopathology of Warthin tumor in the parotid gland. H&E stain Source:<ref name

  File:Papillary cystadenoma lymphomatosum labelled.jpg

  Papillary_cystadenoma_lymphomatosum zones - By Jpogi - ‘’here’’).

  </ref>
• 
  Histopathology of Warthin tumor in the parotid gland. Another view of a file "Warthin tumor (1).jpg". H&E stain..
• 
  Histopathology of Warthin tumor in the parotid gland. Higher magnification of a file "Warthin tumor (1).jpg". H&E stain.
• 
  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

References

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