title: Apocrine hidrocystoma of the cheek.
abstract: BACKGROUND
  Apocrine hidrocystoma is an uncommon benign cystic proliferation of the apocrine sweat glands. Malignant melanoma, eccrine hidrocystoma, angioma, and follicular cysts have to be considered as differential diagnoses.
  
  
  RESULTS
  A 63-year-old man is presented with a dark mass measuring 2 x 2 cm on his right cheek. An exocrine tumor or, more unlikely, a melanoma was considered as a differential diagnosis. Pathologically, the lesion was determined to be an apocrine hidrocystoma.
  
  
  CONCLUSIONS
  This benign lesion can be excised by a narrow margin. Therefore, knowledge of this benign entity in head and neck surgery including the differential diagnosis can prevent an unnecessarily large defect by too large margins.
authors.affiliation: Department of Craniomaxillofacial and Oral Surgery, University of Zurich, Zurich, Switzerland. astrid.kruse@usz.ch
authors.forename: Astrid L D
authors.initials: AL
authors.lastname: Kruse
authors.forename: Roger
authors.initials: R
authors.lastname: Zwahlen
authors.forename: Marius G
authors.initials: MG
authors.lastname: Bredell
authors.forename: Marc O
authors.initials: MO
authors.lastname: Riener
authors.forename: Klaus W
authors.initials: KW
authors.lastname: Grätz
mesh_terms: D002610:Cheek / Q000473:pathology*; D003937:Diagnosis, Differential; D005153:Facial Neoplasms / Q000175:diagnosis*; D005497:Follicular Cyst / Q000175:diagnosis; D006391:Hemangioma / Q000175:diagnosis; D018251:Hidrocystoma / Q000175:diagnosis*; D006801:Humans; D008297:Male; D008545:Melanoma / Q000175:diagnosis; D008875:Middle Aged; D012871:Skin Diseases / Q000175:diagnosis; D013544:Sweat Gland Neoplasms / Q000175:diagnosis*