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The lump is called a Back Mouse. Other names for them are: Episacral lipoma, iliac crest pain syndrome, multifidus triangle syndrome, and lumbar fascial fat herniation.

It is estimated that between 10% to 25% of the population has them.

They are not in the muscle, so they are not "knots".

They are like lipomas (fatty lumps) that a lot of people get. But lipomas are never painful when you push on them.

However, back mice can be painful when you push on them.

Most people who have them can live with them. BUT….

In about 10% of the people who have them they can cause excruciating back pain, or refer pain down the leg. And they can mimic a herniated disc.

For those with Back pain, the true test to see if the back mouse is causing your pain is to have it injected with anesthetic. If that makes the pain go away, you have found the culprit. The anesthetic wears off in a couple hours.

If back mice are creating problems, they can be removed surgically.

What they are is fat that has leaked (herniated) through a rip in the facia (membrane) and often take nerves with it. These rips can be caused by trauma, lifting, sitting too much, or other possible causes.

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14y ago

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