Preauricular sinus and cyst

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Preauricular sinus and cyst
Classification and external resources
Preauricularsinus.jpg
ICD-10 Q18.1
ICD-9 744.4
DiseasesDB 34576
MedlinePlus 003304

A preauricular sinus (also known as a congenital auricular fistula, a congenital preauricular fistula, an ear pit[1]:782, or a preauricular cyst[2]) is a common congenital malformation characterized by a nodule, dent or dimple located anywhere adjacent to the external ear.[3]

They are inherited features and usually appear on one side, but may be present on both sides in 25 to 50% of cases.

Causes[edit]

Preauricular sinuses and cysts result from developmental defects of the first and second branchial arches.[4] This and other congenital ear malformations are sometimes associated with renal anomalies.[5] In rare cases they may be associated with branchio-oto-renal syndrome.

Complications[edit]

Occasionally a preauricular sinus or cyst can become infected.[6]

Most preauricular sinuses are asymptomatic and remain untreated unless they become infected too often.[7] Preauricular cysts are treated with surgery which, because of their close proximity to the facial nerve, is performed by experienced surgeon, such as an otolaryngologist (a head and neck specialist).[8]

See also[edit]

References[edit]

  1. ^ Freedberg, et al. (2003). Fitzpatrick's Dermatology in General Medicine. (6th ed.). McGraw-Hill. ISBN 0-07-138076-0.
  2. ^ Rapini, Ronald P.; Bolognia, Jean L.; Jorizzo, Joseph L. (2007). Dermatology: 2-Volume Set. St. Louis: Mosby. ISBN 1-4160-2999-0. 
  3. ^ Noah S Scheinfeld; Valerie Nozad (Mar 18, 2008). "Preauricular Sinuses". Retrieved 24 Feb 2009. 
  4. ^ From Stedman's Medical Spellchecker cited in WrongDiagnosis.com (2006). "Preauricular Sinus". Retrieved 24 Feb 2009. 
  5. ^ Raymond Y. Wang, Dawn L. Earl, Robert O. Ruder, John M. Graham Jr. "Syndromic Ear Anomalies and Renal Ultrasounds". 
  6. ^ James, William D.; Berger, Timothy G.; et al. (2006). Andrews' Diseases of the Skin: Clinical Dermatology. Saunders Elsevier. ISBN 0-7216-2921-0. 
  7. ^ Stephen Ludwig, Stephan Strobel, Stephen D. Marks, Pete K. Smith, Ph.D., Magdi H. El Habbal, M.D., Lewis Spitz Visual Handbook of Pediatrics and Child Health Published by Lippincott Williams & Wilkins, 2008; page 517. ISBN 0-7817-9505-2
  8. ^ Michael Hawke Ear Disease Published by PMPH-USA, 2003; page 5. ISBN 1-55009-241-3

External links[edit]