Other tumors of bone
Epidermoid inclusion cyst

Author: Nat Pernick, M.D. (see Authors page)

Revised: 20 October 2016, last major update June 2005

Copyright: (c) 2003-2016,, Inc.

PubMed search: epidermoid inclusion cyst [title]

Cite this page: Epidermoid inclusion cyst. website. Accessed December 15th, 2018.
Definition / general
  • Due to squamous epithelium embedded within bone
  • Benign, resembles cutaneous lesion
  • Ages 25 - 50 years
  • Sites: skull, distal phalanx, less commonly in toes
Radiology description
  • Well defined, radiolucent lesion, often associated with soft tissue swelling
Case reports
  • Excision, not amputation
Microscopic (histologic) description
  • Cyst wall composed of keratinized stratified squamous epithelium with keratin debris
  • No skin appendages
Microscopic (histologic) images
Images hosted on other servers:

Xray, toe, H&E

Differential diagnosis