Differences between a Coccygeal Pit and Sacral Dimple
Important information:
Your child may have a dimple low down on the back between the butt cheeks (gluteal folds). This is called a coccygeal pit. It's common and harmless. A coccygeal pit is different from a true sacral dimple, which is higher up on the back and doesn't require the butt cheeks to be spread open to see it.
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| Coccygeal pit: Lower, between butt cheeks |
Sacral dimple: Higher on the back |
Coccygeal pit:
Because a coccygeal pit is lower down, near the tailbone or coccyx, it's typically not a sign of a tethered spinal cord, which affects the lower spine (lumbar spine). Usually, no special tests are needed for a coccygeal pit, and it just needs to be kept clean. There is no need for surgery for the pit itself, and your child’s provider will advise if any imaging is needed.
Sacral dimple and tethered cord:
If your child has a dimple, you might have heard the term "tethered spinal cord" or “tethered cord.” Sometimes, dimples higher up on the back or other skin abnormalities (Y-shaped gluteal crease, hemangioma, or hairy patch) can indicate a tethered cord. A tethered spinal cord means the spinal cord is attached in an abnormal way, often by an extra piece of fat, to the tissues around it. This can lead to problems with legs, bowel, and bladder as they grow. Surgery is often recommended to prevent these issues or stop them from getting worse.
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Reviewed July 2024 by Allison Rodman PA-C
© Children's Hospital of Philadelphia 2024. Not to be copied or distributed without permission. All rights reserved. Patient family education materials provide educational information to help individuals and families. You should not rely on this information as professional medical advice or to replace any relationship with your healthcare provider.