Iran J Vet Surg, Print ISSN: 2008-3033, Online ISSN: 2676-6299

Document Type : Clinical Report


1 Department of Surgery, Avina pet Hospital, Tehran, Iran

2 Razi Vaccine and Serum Research Institute, Agricultural Research, Education and Extension Organization (AREEO), Karaj, Iran


Epididymal agenesis is described as the complete or partial lack of the epididymis. In this paper, a two-year-old Pekingese dog with epididymal agenesis is reported during routine castration. The dog was presented to a private pet hospital for conventional castration. Anatomically unilateral epididymal agenesis was observed during orchiectomy. Also, pathologically segmental unilateral epididymal agenesis and atrophy of testis were implied. The dog was neutered. Epididymal agenesis is a highly rare phenomenon in all breeding dogs. To the authors’ knowledge, this is the first report of epididymal agenesis in small breeding dogs. This kind of animal should not use for breeding programs and practitioners pay attention to this anomaly while encountered infertility in dogs.


Main Subjects

  1. Robaire B, Hinton BT, Orgebin-Crist M-C. The epididymis. In: Knobil and Neill's physiology of reproduction. Elsevier; 2006: 1071-1148.
  2. Bouchard M, Souabni A, Mandler M, Neubüser A, Busslinger M. Nephric lineage specification by Pax2 and Pax8. Genes and Development, 2002; 16(22): 2958-2970.
  3. Plant TM, Zeleznik AJ. Knobil and Neill's physiology of reproduction. Academic Press; 2014.
  4. McCullough R, Marshall F, Berry S, Detweiler C. The influence of epididymal agenesis on the development and maturation of the testis: experimental model and clinical correlations. Urological Research, 1984; 12(3): 165-170.
  5. Jiang X, Skibba M, Zhang C, Tan Y, Xin Y, Qu Y. The roles of fibroblast growth factors in the testicular development and tumor. Journal of Diabetes Research, 2013.
  6. Cyr DG, Finnson K, Dufresne J, Gregory M. Cellular interactions and the blood-epididymal barrier. In: The epididymis: from molecules to clinical practice. Springer; 2002: 103-118.
  7. Olsen D, Salwei R. Surgical correction of a congenital preputial and penile deformity in a dog. Journal of the American Animal Hospital Association, 2001; 37(2): 187-192.
  8. Rezaei M, Azizi S, Akhtardanesh B, Azari O, Hassibi H, Taheri Bojd T. Hypospadias and testicular agenesis in two German Shepherd puppies. Iranian Journal of Veterinary Surgery, 2016; 11(1): 51-55.
  9. Settergren I. Examination of the canine genital system. The Veterinary Clinics of North America, 1971; 1(1): 103-118.
  10. Ettinger SJ, Feldman EC, Cote E. Textbook of Veterinary Internal Medicine-eBook. Elsevier health sciences; 2017.
  11. Badr YAA, Motlagh RS, Sepehran E. Bilateral isolated epididymal agenesis in a 32 year old man. International Brazilian Journal of Urology, 2015; 41(2): 379-381.
  12. Grimm KA, Lamont LA, Tranquilli WJ, Greene SA, Robertson SA. Veterinary anesthesia and analgesia. 5th edn. John Wiley & Sons; 2015.
  13. Batista M, González F, Rodriguez F, Palomino E, Cabrera F, Forga J, Gracia A. Segmental aplasia of the epididymis in a Siberian husky. The Veterinary Record, 1998; 142(10): 250-251.
  14. Ladds P, Briggs G, Foster R. Epididymal aplasia in two rams. Australian Veterinary Journal, 1990; 67(12): 457-458.
  15. König H, Weber W, Kupferschmied H. Epididymal aplasia in bulls and boars. a. Demonstration of 18 cases with recessive inheritance in the Simmentaler spotted breed. b. Occurrence of abnormalities in one boar and 3 offsprings. Schweizer Archiv Fur Tierheilkunde, 1972; 114(1): 73-82.