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Medical Health Encyclopedia
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Pilonidal dimple

Osteoarthritis Questions and AnswersBack Pain InformationCauses of Back Pain



Anatomical landmarks, back view
Anatomical landmarks, back view
Pilonidal cyst and dimple
Pilonidal cyst and dimple


Pilonidal dimple

Definition:

Pilonidal dimple is a small pit or sinus in the sacral area at the very top of the crease between the buttocks.

Alternative Names:
Sacral dimple

Text Continues Below



Considerations:

The majority of pilonidal dimples are harmless, congenital anomalies that consist of a small depression or pit. There may be increased hairiness around the area.

The pilonidal dimple may also be a deep tract, rather than a shallow depression, leading to a sinus that may contain hair. These can become infected and drain. On rare occasions, the sinus may extend into the spinal cord.

During adolescence, the pilonidal dimple or tract may become infected, forming a cyst-like structure called a pilonidal cyst. These may require surgical drainage or total excision to prevent reinfection.

Common Causes:

  • congenital pilonidal dimple
  • congenital dermal sinus (of which the dimple is the mildest form)


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