Inflammatory / infectious / autoimmune / systemic disorders

Idiopathic cystic chondromalacia of auricular cartilage

Topic Completed: 1 October 2013

Minor changes: 14 December 2020

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PubMed Search: Cystic chondromalacia of auricular cartilage

Nat Pernick, M.D.
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Cite this page: Pernick N. Idiopathic cystic chondromalacia of auricular cartilage. PathologyOutlines.com website. https://www.pathologyoutlines.com/topic/earidiopathiccystic.html. Accessed December 8th, 2021.
Definition / general
  • Also called auricular or endochondral pseudocyst
  • Benign cystic degeneration of auricular cartilage of unknown cause
  • Usually men age 20 - 40 years
  • Unilateral swelling of cartilage over weeks to years, most commonly on scaphoid fossa of auricle
  • May be due to minor trauma
Case reports
  • Excision
Microscopic (histologic) description
  • Fluid filled distended mass composed of cyst like wall with fibrous and granulation tissue lining but no epithelium
  • Cyst contains 1 - 2 mm rim of cartilage
  • Cyst fluid resembles olive oil
  • No / mild atypia
Microscopic (histologic) images

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Central cystic degeneration of auricular cartilage

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Factor VIII+ lining of pseudocyst

Differential diagnosis
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