title: Adenosquamous carcinoma of unknown primary origin: a case report and literature review.
abstract: BACKGROUND
  Adenosquamous carcinoma is a rare variant of semicircular canal that can affect various regions, including the head and neck. Adenosquamous carcinoma is characterised pathologically by the simultaneous presence of distinct areas of semicircular canal and adenocarcinoma, and usually takes an aggressive course with local recurrences, early lymph node metastases and distant disseminations.
  
  
  METHODS
  We report a rare case of neck adenosquamous carcinoma of unknown primary origin, which was well-controlled by thorough resection without any other additional therapy.
  
  
  CONCLUSIONS
  We discuss the diagnosis and treatment of adenosquamous carcinoma along with a review of pertinent literature. We also consider the potential differential diagnosis of branchiogenic carcinoma.
authors.affiliation: Division of Otorhinolaryngology,Head and Neck Surgery,Sasebo Kyosai Hospital,Sasebo City,Japan.
authors.forename: T
authors.initials: T
authors.lastname: Takeuchi
authors.affiliation: Division of Otorhinolaryngology,Head and Neck Surgery,Sasebo Kyosai Hospital,Sasebo City,Japan.
authors.forename: T
authors.initials: T
authors.lastname: Yasui
authors.affiliation: Division of Pathology,Sasebo Kyosai Hospital,Sasebo City,Japan.
authors.forename: M
authors.initials: M
authors.lastname: Izeki
authors.affiliation: Department of Otorhinolaryngology,Graduate School of Medical Sciences, Kyushu University,Fukuoka City,Japan.
authors.forename: S
authors.initials: S
authors.lastname: Komune
mesh_terms: D000368:Aged; D018196:Carcinoma, Adenosquamous / Q000556:secondary* / Q000601:surgery; D006258:Head and Neck Neoplasms / Q000556:secondary* / Q000601:surgery; D006801:Humans; D008297:Male; D009382:Neoplasms, Unknown Primary
keywords: Branchiogenic Carcinoma