title: Cystic clear cell myoepithelioma of the parotid gland. A case report.
abstract: BACKGROUND
  Myoepitheliomas of salivary glands are generally encapsulated, slowly growing asymptomic solid masses in which more than 50% are seen in the parotid gland. Cystic myoepitheliomas are very rare.
  
  
  METHODS
  We present an 80-year-old man with a cystic mass in the right parotid gland that had undergone superficial parotidectomy. In gross examination, a mass containing a large cyst was observed. Microscopically, tumor consisted of clear cells and small cuboidal cells, forming tubules in a hyalinized stroma. Immunohistochemically, clear cells were immunoreactive for S100 and smooth muscle actin. Cuboidal cells were positive for cytokeratin. Diagnostic and differential diagnostic criteria were discussed under the light of the current literature.
authors.affiliation: Department of Pathology, Ministry of Health, Ankara Training and Research Hospital, Ankara, Turkey. nuransungu@gmail.com
authors.forename: Hesna Muzeyyen
authors.initials: HM
authors.lastname: Astarci
authors.forename: Asuman
authors.initials: A
authors.lastname: Celik
authors.forename: Nuran
authors.initials: N
authors.lastname: Sungu
authors.forename: Huseyin
authors.initials: H
authors.lastname: Ustun
mesh_terms: D000199:Actins / Q000032:analysis; D000369:Aged, 80 and over; D014408:Biomarkers, Tumor / Q000032:analysis; D006801:Humans; D007633:Keratins / Q000032:analysis; D008297:Male; D009208:Myoepithelioma / Q000473:pathology / Q000601:surgery*; D010306:Parotid Gland / Q000473:pathology / Q000601:surgery; D010307:Parotid Neoplasms / Q000473:pathology / Q000601:surgery*; D009418:S100 Proteins / Q000032:analysis
chemical_list: D000199:Actins; D014408:Biomarkers, Tumor; D009418:S100 Proteins; D007633:Keratins