Testis and epididymis
Anorchia / monorchidism / testicular regression

Topic Completed: 1 December 2012

Revised: 27 March 2019

Copyright: 2002-2018, PathologyOutlines.com, Inc.

PubMed Search: Anorchia [title] OR monorchidism [title] OR testicular regression [title]

Sean R. Williamson, M.D.
Page views in 2019: 229
Page views in 2020 to date: 25
Table of Contents
Definition / general
Cite this page: Williamson S. Anorchia / monorchidism / testicular regression. PathologyOutlines.com website. https://www.pathologyoutlines.com/topic/testisanorchia.html. Accessed February 21st, 2020.
Definition / general
  • Absence of one (monorchidism) or both testes
  • If phenotypically normal male and vas deferens is present, indicates a testicular regression syndrome caused by infection, trauma, torsion or prenatal hormone induced atrophy due to overproduction of androgens
  • A regressed testis is indicated by presence of a nodule of fibrosis, hemosiderin deposition, calcification or Leydig cells, in association with epididymis or proximal vas deferens
  • Presence of fat and connective tissue only does not rule out an intra-abdominal testis
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