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I would recommend a ultrasound and tapping the contents, that should diagnose the condition. Considering the peracute appearance of the lump, I would consider a seroma, hematoma (aneurysm?), or synovial outpouching (weakness or tear) of the carpal sheath of the flexor tendons but there are a number of structures underlying and bordering that location and none often present that way when diseased.
Until diagnosed I would be cautious about exercise and consider wraps to reduce or at least support the tissue.
Some further questions that may help:
When you press on it does it bounce back immediately or form a depression that fills back slowly? And while doing this does the swelling then move to the other side of the leg?
Can you move the lump around as though it is not attached to underlying tissues?
Is it warm or the same temperature as the surrounding skin?
DrO -
It bounces back quickly. It looks like fluid. I can’t see it come out the other side of the leg. It’s not a tumor. It doesn’t feel like a lump that is attached to anything, and it is not in the skin. It isn’t hot. The other leg looks a little filled in the same area, but no visible bump. Her hocks look like they might have a little puffiness as well. It looks a little flatter, I think. She hasn’t done anything but eat for almost a week.
This horse NEVER lays down or rolls. I have seen her do it twice. Once when she had sore feet. The other was when she had 106 degree fever with tick fever. I have always wondered if it puts more wear and tear on her legs.
Attached is a new picture of the bump, and then two pictures of her hocks. When I look at my 6 year old, everything is tight. She has big indentations on the side of her hocks. The old mare’s hocks are filled in the same area.
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OK
The last two images are of her hocks showing that she has fluid in the area that is mostly skin. The top one has the bump. I believe it has flattened a little. Is there anything other than old age, more exercise than usual, that would cause generalize joint swelling? Again, I’m not seeing any lameness.
She’s about my age in people years. I know that I swell in my ankles when I’ve done weekend warrier activities.
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Your area indicated in the image is mislabeled, that is the proximal DDF flexor tendon sheath. Unlike your carpal swelling, the swelling of this sheath is common in older horses and often referred to as “throughpin (thoroughpin)” as it usually seen on both the inside and outside of the leg. Pushing on one side makes the other side bigger.
In short this is a common swelling usually not associated with lameness but you can read more about this at Overview of Diseases of the Hock (Tarsus)
DrO -
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