MRI: Pilonidal Cyst causing "Coccyx Pain", Tailbone Pain
This is a video just showing a pilonidal cyst on an MRI. So basically here, just to orient you, we're looking at MRI slices. We're looking at the sacroiliac joint on the right and over here on the left. And then here's the sacrum. You can just see the start of the where you can see the sacral canal here and a little bit of the sacral hiatus. And if I start scrolling down we get down to lower sacrum right where the arrow is here. The computer is a little sluggish. But coming down here we can see the coccyx on cross-section here at oval-shaped white structure.
And then here is the pilonidal cyst. So this bright white structure on this particular type of MRI image, where basically the white structure here is the pilonidal cyst. And then this white line extending to the surface (because out here this is the skin out here, coccyx there). So the pilonidal cyst has a "track" or "fistula tract" = the connection or tunnel coming down to the surface of the skin right there. Here you can just see the line, that's the track. And the coccyx has now disappeared, so we're actually now below the coccyx.
So the pilonidal cyst was right at the back of the coccyx slightly to this side here. So this is the midline, so slightly to this side. This is actually slightly to the left of midline. I know that on the image it looks like it's to the right, but that's because the way the patient is laying, the way the image is taken. Things over here on this side of the screen will be on the patient's right side. Whereas this side of the screen over here will be the patient's left side so this is just slightly to the side. .
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