Ear
External ear tumors - benign / nonneoplastic
Keloid


Topic Completed: 1 October 2013

Revised: 26 August 2019

Copyright: (c) 2002-2019, PathologyOutlines.com, Inc.

PubMed Search: Keloid [title] ear pathology


Nat Pernick, M.D.
Page views in 2018: 6,361
Page views in 2019 to date: 6,071
Cite this page: Pernick N. Keloid. PathologyOutlines.com website. http://www.pathologyoutlines.com/topic/earkeloid.html. Accessed October 21st, 2019.
Definition / general
Case reports
Treatment
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
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
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