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Lump at the base of my thumb [Archive] - RonFez.net Messageboard
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ImetRoninthePark
10-16-2008, 10:45 PM
Dr. Steve,

Tonight I discovered a bump at the base of my right thumb. It's located at base of my thumb and my wrist (right at my first wrist wrinkle). I'm in my 20's overweight (of course), and do play lots of video games, and am on my laptop almost all day. Knowing this I looked around the internet and discovered what I think it is. Ganglion cyst. The cause isn't always known but over exertion is thought to be one of them. Any help would be appreciated.

Matt
Dr Steve
10-20-2008, 04:19 PM
Dr. Steve,

Tonight I discovered a bump at the base of my right thumb. It's located at base of my thumb and my wrist (right at my first wrist wrinkle). I'm in my 20's overweight (of course), and do play lots of video games, and am on my laptop almost all day. Knowing this I looked around the internet and discovered what I think it is. Ganglion cyst. The cause isn't always known but over exertion is thought to be one of them. Any help would be appreciated.

Matt

Could very well be a ganglion cyst, or you could have an area of focal tendonitis...either could cause a swelling in the base of the thumb. If there's no tenderness, that would favor a ganglion cyst.

For those who are wondering, I explain a ganglion cyst thusly:

Joints are sealed off by a tough fibrous tissue called "synovial tissue", and lubricated on the inside of this sheath by "synovial fluid". Now, the outer layer of this tissue is very tough, but the inner layer is elastic. It's similar to having a tire with an innertube...if the outside tire splits, the innertube will bloop out of the split, causing a bubble, or ballooning effect. A ganglion cyst occurs when the outer layer of synovial tissue splits, allowing the inner layer to bloop out, making a cyst that is filled with crystal clear synovial fluid/jelly.

https://services.epnet.com/GetImage.aspx/getImage.aspx?ImageIID=4856

This can also happen to the layer that covers tendons.

One way to find out is to shine a light from BEHIND the cyst...if it lights up, it's filled with clear liquid and it's almost certainly a ganglion.

If it grows, or hurts, or gets red, or bothers you in any way, go see your regular doctor.

hope this helps!


your pal,


steve

(XBOX Gamertag: darth scratchy)