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J Am Vet Med Assoc. 1989 Jan 15;194(2):267-8.

Sperm granuloma in a stallion.

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  • 1Department of Rural Practice, College of Veterinary Medicine, University of Tennessee, Knoxville 37901-1071.


A 7-year-old stallion with a history of abdominal pain after it fell was examined and found to have a swelling of the right testis and epididymis. Semen evaluation revealed an increase in secondary sperm abnormalities. The stallion was unilaterally castrated. The histologic diagnosis was sperm granuloma, with no evidence of infection. Periductal fibrosis was observed and appeared to have developed before the trauma occurred. The changes seen could be compatible with chronic blockade of efferent ductules, resulting in extravasation of spermatozoa.

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