Testis and epididymis
Non-neoplastic testicular lesions
Anorchia / monorchidism / testicular regression
Reviewer: Sean Williamson, M.D. (see Reviewers page)
Revised: 20 April 2013, last major update December 2012
Copyright: (c) 2002-2013, PathologyOutlines.com, Inc.
- 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 intraabdominal testis
End of Testis and epididymis > Non-neoplastic testicular lesions > Anorchia / monorchidism / testicular regression
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