title: [Apocrine hidrocystoma associated with gouty tophi of the pinna].
abstract: BACKGROUND
  Apocrine hidrocystomas, also known as apocrine cystadenomas, are bening cystic tumours derived from the secretory portion of apocrine sweat glands.
  
  
  METHODS
  A 78-year old female was referred to our division for assesment an asymptomatic translucent, well-defined cystic lesion located on the upper helix. The histological features were consistent with apocrine hidrocystoma coexisting with gouty tophi.
  
  
  CONCLUSIONS
  We report the second case of apocrine hydrocystoma located in the pinna, outside of ear canal and the first case of its association with gouty tophi described. It is difficult to know which lesion was first established and if the tophi may lead to ductal obstruction and subsequent cystic retention.
authors.affiliation: Departamento de Dermatología, Hospital Clínico Universitario "Lozano Blesa", Servicio Aragonés de Salud, Zaragoza, España. tamgracaz@gmail.com.
authors.forename: Tamara
authors.initials: T
authors.lastname: Gracia-Cazaña
authors.forename: Ievgenia
authors.initials: I
authors.lastname: Pastushenko
authors.forename: Marta
authors.initials: M
authors.lastname: Lorda
authors.forename: Esteban
authors.initials: E
authors.lastname: Padgett
authors.forename: Ana Luisa
authors.initials: AL
authors.lastname: Morales-Moya
mesh_terms: D000368:Aged; D001050:Apocrine Glands / Q000473:pathology*; D054644:Ear Auricle / Q000473:pathology*; D004428:Ear Neoplasms / Q000150:complications / Q000175:diagnosis* / Q000473:pathology; D005260:Female; D006073:Gout / Q000150:complications / Q000175:diagnosis* / Q000473:pathology; D018251:Hidrocystoma / Q000150:complications / Q000175:diagnosis* / Q000473:pathology; D006801:Humans; D013544:Sweat Gland Neoplasms / Q000150:complications / Q000175:diagnosis* / Q000473:pathology
keywords: Apocrine glands; Gout; Hidrocystoma; Neoplasms