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Castrated Cryptorchid - Tested positive for test. tissue

This category is to be used for general stallion questions that are not covered by other category descriptions.

Moderator: Jos

Castrated Cryptorchid - Tested positive for test. tissue

Postby Riding2Win » Tue May 17, 2016 2:20 pm

I have a 5 year old Hanoverian gelding who was a bilateral cryptorchid colt (just to be clear, I bred him and have had him in my care his entire life, so there is no question about his history). I had him surgically castrated at one year old. My vet at the time, who I felt was skilled and competent to perform this surgery and whom I had a good relationship with and trusted, told me after the surgery that he removed two abnormally small testicles and felt "99.9% sure he got everything". I saw the two testicles with my own eyes, they were about the size of a man's thumb. As a three year old, the gelding started showing minor stallion-like behaviors and I started him on chaste tree berry and the behavior subsided. Last spring (4 years old), he was in a mixed pasture and I caught him mounting and penetrating one of my mares. I immediately separated him from the mares and he was aggressive towards the geldings he was then pastured with. He did eventually settle down with the geldings and "got along" with them, but he would pace the fenceline calling to the mares and would also drop and masturbate. Chaste tree berry really didn't make a big difference. The vet who had performed the castration had moved away and the vet I was using at the time was not very helpful with advice, only wanting to "refer me to a specialist" without doing any diagnostics himself. Fast forward to this year, I have moved to a new area and I recently had a new mobile practice vet pull blood to check testosterone levels while he was out doing microchips. I'm not certain which test was run, I believe it was the estrone sulfate baseline, but I'm not 100% certain. The vet mentioned since my gelding was 5, the test he was doing was recommended for older geldings. It was not the hCg test, because we only pulled one blood sample. When he called to tell me the results, he explained that a stallion would test 15,000 (I forgot the unit of measurement!) and a gelding would be under 1500. My "gelding" tested 15,000, equivalent to a stallion, indicating retained testicular tissue without question. I am going to speak with my new, highly respected repro vet when I haul my mares in for preg checks next week, but in the meantime, I'm wondering what I am looking at for this gelding. Exploratory surgery seems to be the only option? What would we be looking for? A tiny piece of testicular tissue? A rare extra testicle? Both options? How likely will it be to find the "needle in the haystack"? He's a well bred gelding and I have had high hopes for him as a sporthorse, but with this issue, his training has been coming along slow. I would love to make a good gelding out of him, but I have concerns over how successful and how involved a process this will be.
Riding2Win
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Re: Castrated Cryptorchid - Tested positive for test. tissue

Postby Jos » Wed May 18, 2016 8:39 am

Firstly, it is important to observe that geldings can and do still breed mares, even though they have no testicles. Not all do, but some will, up to and including full intromission. It is possible therefore that all you are seeing is a normal gelding.

Having said that, a review of stallion "normals" is available on the BET Labs website, which may assist. While additional testicles have been reported, they are rare. Leaving "a piece of" testicular material is extremely unlikely.

Overall, I feel a second opinion may be valuable for you.
We're always happy to try and help, but don't forget to check the articles section
of the website too, which has a search engine to help you look for answers!
:)
User avatar
Jos
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Re: Castrated Cryptorchid - Tested positive for test. tissue

Postby Riding2Win » Wed Jul 20, 2016 3:45 pm

I just wanted to post an update to my original post in case this topic may be of help to someone in the future. It appears I have somewhat of a rare case. After breeding season was over and I didn't need to haul any mares to the clinic, I took my gelding to my repro vet for his opinion. I had given him the bloodwork info given to me by my other vet and explained the gelding's behavior. He rectally ultrasounded his abdomen and found a decent size mass near the inguinal ring. He performed surgery on the gelding today. He said in 35 years of practice, he had never seen anything like the mass my gelding had. He said it was the size of a softball, attached to a smaller "stalk" of epididymal tissue. The cells were abnormal under microscope and coupled with the size of the tumor, he sent off a biopsy to let us know if we are dealing with a possible testicular tumor. I've been researching and am seeing testicular tumors are rare in horses (largely in part due to the large numbers of colts castrated at an early age) and information is pretty sparse. But I did come across Leydig Cell Tumors, which apparently are associated with cryptorchids, can produce testosterone and can be associated with aggressive behavior. I will update with the biopsy results when I get them, as this is pure speculation on my part at this point. Although, whatever is going on with my gelding is certainly abnormal, I'm hoping this information is at least an interesting read!
Riding2Win
Neonate
 
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Joined: Tue May 17, 2016 1:30 pm

Re: Castrated Cryptorchid - Tested positive for test. tissue

Postby Jos » Tue Aug 30, 2016 5:05 pm

Did you get any more information about this mass? Did the biopsy identify a tumour, and if so, of what cells?
We're always happy to try and help, but don't forget to check the articles section
of the website too, which has a search engine to help you look for answers!
:)
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Jos
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Posts: 3948
Joined: Sun Jun 10, 2012 12:11 am


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