Photograph of a unilaterally enlarged testis in a bull: the animal is in dorsal recumbency, cranial is to the left, and the enlarged left testis is sitting atop the normal right testis which is at the handler's thumb. Several causes can lead to this finding including orchitis/epididymitis, scrotal hernia, trauma, and neoplasia. A finding like this would likely render a bull an unsatisfactory prospective breeder.