External ear tumors - benign / nonneoplastic

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

Revised: 23 February 2018, last major update October 2013

Copyright: (c) 2002-2018, PathologyOutlines.com, Inc.

PubMed Search: Keloid [title] ear pathology

Cite this page: Pernick, N. Keloid. PathologyOutlines.com website. http://www.pathologyoutlines.com/topic/earkeloid.html. Accessed October 20th, 2018.
Definition / general
Case reports
Gross description
  • Polypoid, covered by thin, hairless skin
  • Usually < 2 cm
Microscopic (histologic) description
  • Nonencapsulated
  • Haphazard fascicles of dense, hyalinized collagen that appear edematous due to dermal mucosubstances
  • Scattered fibroblasts and myofibroblasts
  • Blends with adjacent dermal tissue
  • Overlying epithelium is thin and lacks adnexae
  • Widely scattered dilated blood vessels
Microscopic (histologic) images

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Missing Image

Various images

Differential diagnosis
  • Dermatofibroma: more cellular
  • Dermatofibrosarcoma protuberans: more cellular, usually pseudoepitheliomatous hyperplasia of overlying epidermis
  • Hypertrophic scar: delicate fibrillar collagen in orderly arrangement, usually no abundant mucosubstances; does not recur