Warthin's Tumor : Fine Needle Aspiration
Fine needle aspirate (FNA) smear of a Warthin’s tumor (WT) showing cohesive sheets and clusters of oncocytic cells arranged in a honeycomb pattern. The background usually shows scattered lymphocytes, although they are not seen in this image (PAP stain). Prior manipulation or FNA can cause secondary changes in WT. They include cytologic atypia, metaplasia (squamous and mucous), hemorrhage, infarction, necrosis, acute and chronic inflammation, fibrosis, granulation tissue formation and changes of pseudoinvasion.