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Testicular and epididymal appendages are remnants of embryonic ducts and are quite common, with one or more being present in ~70% of patients 1.
Four such appendages have been described:
testicular appendix (hydatid of Morgagni)
- it is a Müllerian duct remnant (paramesonephric duct)
- it is a Wolffian duct remnant (mesonephric duct)
- vas aberrans (of Haller)
paradidymis (Giraldes organ)
- vestigial structure located on the distal portion of the spermatic cord 1
A testicular appendix may be seen between the testis and epididymis on normal sonography, in many instances. An epididymal appendix is attached to the head of the epididymis and may be seen during sonography in one or both testes. However, both vas aberrans and paradidymis are not usually seen during imaging.
- 1. Favorito LA, Cavalcante AG, Babinski MA. Study on the incidence of testicular and epididymal appendages in patients with cryptorchidism. Int Braz J Urol. 2005;30 (1): 49-52. Pubmed citation