Appendix of the epididymis

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Drawing showing the appendix of epididymis. (WC/Gray's Anatomy)

Appendix of the epididymis, also epididymal appendix, is a benign structure thought to be derived from the mesonephric duct (or Wolffian duct).[1]

It should not be confused with appendix of the testis.


  • Identifiable on ultrasound.[2]
  • Seen in approximately 20% of the population.[1]



  • Thin walled cyst on head of the epididymis.
  • Typically on a stalk.



  • Cyst lined by pseudostratified cilitated epithelium.
  • Dense collagen (wall).
  • Mesothelium (external aspect).


See also


  1. 1.0 1.1 1.2 1.3 Sahni, D.; Jit, I.; Joshi, K.; Sanjeev, . (Oct 1996). "Incidence and structure of the appendices of the testis and epididymis.". J Anat 189 ( Pt 2): 341-8. PMID 8886956.
  2. Kantarci, F.; Ozer, H.; Adaletli, I.; Mihmanli, I. (Dec 2005). "Cystic appendix epididymis: a sonomorphologic study.". Surg Radiol Anat 27 (6): 557-61. doi:10.1007/s00276-005-0034-3. PMID 16195812.

External links