Testis and epididymis
Rete testis
Cystic dilation (transformation)



Topic Completed: 1 March 2012

Revised: 29 March 2019

Copyright: 2003-2017, PathologyOutlines.com, Inc.

PubMed Search: cystic dilation rete testis

Rafael Jimenez, M.D.
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Cite this page: Jimenez R. Cystic dilation (transformation). PathologyOutlines.com website. http://www.pathologyoutlines.com/topic/testisretecysticdilationrete.html. Accessed December 7th, 2019.
Definition / general
  • Due to obstruction of epididymis or intratesticular excretory ducts
  • Also after hemodialysis and associated with calcium oxalate deposits in lumen of rete testis, efferent ducts and adjacent connective tissue (Hum Pathol 1996;27:336)
  • Identified in 1% of autopsy / surgical specimens in Spain (Am J Surg Pathol 1996;20:1231)
  • Usually bilateral
  • Causes: compression of epididymis by tumor of epididymis or spermatic cord, chronic epididymitis, ischemia, cirrhosis and cryptorchidism
  • References: Hum Pathol 1989;20:1065
Microscopic (histologic) description
  • Bilateral efferent duct atrophy, nodular proliferation of calcifying connective tissue, columnar transformation of rete testis epithelium and occasional papillary proliferations
  • No atypia, no mitotic figures
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