EDUCATION > Educational Programs > E-Learning > Pathology for Urologists

Pathology for Urologists

Testicular Appendages


Image A
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Image B
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Appendix testis (Hydatid of Morgagni)

  • Present in >90% of testis, usually at the anterior-superior aspect beneath the epididymis head.
  • "Fan-shaped" appendage attached to the tunica vaginalis surrounded by columnar epithelium (image A).
  • Torsion may occur due to its pedunculated nature
  • Represents the blind cranial end of Müllerian (paramesonephric) duct remnant.

Image C
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Image D
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Appendix epididymis

  • Present in >30% of testis, often at the superior aspect of epididymis head (image B) & (image C).
  • Cystic structure lined by columnar epithelium and filled with serous fluid (image D).
  • Subject to torsion.
  • Represents the blind cranial end of the Wolffian (mesonephric) duct remnant.
  • Torsion of testicular appendages result to bluish discoloration at the superior aspect of the testicle (blue-dot sign), but present in only 1/5 of patients.

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