External ear tumors - benign / nonneoplastic

Keratinous cyst

Topic Completed: 1 October 2013

Minor changes: 14 December 2020

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PubMed Search: Keratinous cyst ear

Nat Pernick, M.D.
Page views in 2020: 2,290
Page views in 2021 to date: 2,799
Cite this page: Pernick N. Keratinous cyst. PathologyOutlines.com website. https://www.pathologyoutlines.com/topic/earkeratinouscyst.html. Accessed December 8th, 2021.
Definition / general
  • Common around external ear
  • Related to branchial cleft or epidermal inclusion cysts
  • Recurrence rate of 13% with punch incision technique (Dermatol Surg 2002;28:673)
Case reports
Microscopic (histologic) description
  • Lined by keratinized squamous epithelium, filled with keratin
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