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Discussion on Enlarged corpora nigra?

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Kendal M Morris (10nycav)
Posted on Thursday, Jun 21, 2001 - 6:44 pm:   Edit PostPrint Post

I'm not sure about the right name for this condition, but I heard recently about a horse that had unusually large corpora nigra that interfered with his vision. This was corrected surgically although I'm not sure about the details of the procedure, it was relatively non-invasive.

I have a friend with a 15 yr old Morgan mare that has very large corpora nigra. The largest are about the size of small pea. She is always "on edge" despite being fed a "non-hot" diet and getting outside for exercise every day. I wonder if the behavioral problems may be related to vision problems? How can you tell if the corpora nigra are large enough to cause a problem? Does anyone know anything about the corrective procedure (name, cost)?

Ken Morris
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Robert N. Oglesby DVM (Dro)
Posted on Friday, Jun 22, 2001 - 8:30 am:   Edit PostPrint Post

I am afraid it would be impossible to tell if this was the cause of the spookiness without removing them. Behavorial problems and performance impairment (visual impairment 5 cases, decreased jumping performance 2 cases, or head shaking 1 case) in horses with cystic corpora have improved following treatment. A history of worsening problems with increasing size of the cystic corpora is probably significant in putting cause and effect together.

The surgery I am familiar with is using a laser to "deflate" the cystic structures. I am not sure how this would work on a solid structure but the difference between the two may be determined by a history of enlarginf over time, visually it may appear lighter than the surrounding corpora, or with an ultrasound.
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Username: Penner

Post Number: 136
Registered: 8-2001
Posted on Thursday, Nov 13, 2003 - 5:19 pm:   Edit PostPrint Post

Hi Dr O,

Just curious on the status of the laser surgery now (2 yrs later from this last post), to remove cysts of the corpora nigra. Is the laser surgery considered experimental?

Who or what academic center (in the W/ SW USA preferably..)is doing the laser surgeries? (because I had only been told of the aspiration type surgery which had complications of blood in the anterior chamber, etc.)

Thank you!
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Robert N. Oglesby DVM
Username: Dro

Post Number: 9471
Registered: 1-1997
Posted on Friday, Nov 14, 2003 - 11:00 am:   Edit PostPrint Post

Hello Penner,
Dr. Gilger continues to do these here in NC in the standing horse. I do not have a easy way to track down where the procedure is done in the West but if you contact a veterinary opthamlogist at a university teaching hospital you can probably get a referral.
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