1. 1. Schumacher J, Varner DD. Abnormalities of the spermatic cord. In: McKinnon AO, Squires EL, Vaala WE, et al, eds. Equine reproduction. 2nd ed. Chichester, West Sussex, England: Wiley-Blackwell, 2011; 1145–1155.
2. 2. Johnson AK, Love CC. Epididymal abnormalities. In: McKinnon AO, Squires EL, Vaala WE, et al, eds. Equine reproduction. 2nd ed. Chichester, West Sussex, England: Wiley-Blackwell, 2011; 1156–1160.
3. 3. Benson M, Zadvinskis D, Som PM, et al. Embryology and congenital cystic lesions. In: Som PM, Curtin HD, eds. Head and neck imaging. 3rd ed. St Louis: Mosby, 1996; 763–769.