title: A Rare Cause of Hemifacial Spasm: Papillary Oncocytic Cystadenoma.
abstract: BACKGROUND
  Hemifacial spasm is a sudden, involuntary and synchronous spasm of the facial muscles. The most frequent cause of this condition is compression of the facial nerves due to vascular pathologies. The most commonly used method of treatment is Botulinum toxin injection. However, the gold standard treatment is surgical treatment.
  
  
  METHODS
  A 64-year-old male patient with hemifacial spasms, which had occurred due to a rare parotid mass that had been surgically treated, is presented in this case.
  
  
  CONCLUSIONS
  This case report demonstrates that longstanding parotid gland masses may compress the facial nerves and cause demyelination in the nerve and thus may cause spasms in the facial muscles.
authors.affiliation: Department of Otorhinolaryngology, Başkent University School of Medicine, Ankara, Turkey.
authors.forename: Ozan
authors.initials: O
authors.lastname: Erol
authors.affiliation: Department of Otorhinolaryngology, Başkent University School of Medicine, Ankara, Turkey.
authors.forename: Erdinç
authors.initials: E
authors.lastname: Aydın
keywords: Hemifacial spasm; facial nerve; parotid tumor