Parotid tumors

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Benign (80%)

  • Pleomorphic adenoma (70%)
    • aka Benign mixed tumor
    • Calcifications (unlike Warthin's)
    • Malignant transformation reported up to 15% if left untreated
  • Warthin's tumor
    • aka Papillary cystadenoma lymphomatosum
    • M>F
    • Hot on 99mTc-Pertechnetate (pleomorphic adenoma cold)
    • Malignant transformation (carcinoma or lymphoma) reported in < 1%


Malignant (20%)

  • Mucoepidermoid carcinoma (5%)
  • Carcinoma arising from pleomophic adenoma
  • Adenoid cystic carcinoma = cylindroma (2%)
  • Adenocarcinoma (4%)
  • Squamous cell carcinoma (2%)
  • Oncocytic carcinoma (1%)