What is the Difference Between Fistula and Pilonidal Sinus?

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A fistula and a pilonidal sinus are both abnormal tracts or channels through the tissue, often associated with abscesses and drainage in the anal region. However, there are key differences between the two conditions:

  1. Tract Direction: In a pilonidal sinus, the tract leads to a collection of hair and debris, while the tract of a fistula extends from the skin all the way to the anal wall.
  2. Location: A pilonidal sinus is a small tunnel or cavity that usually forms at the top of the crease between the buttocks. An anal fistula, on the other hand, is a connection between the anal canal and the skin around the anus.
  3. Cause: Pilonidal sinuses are often caused by ingrown hairs or hair fragments that penetrate the skin and become infected, leading to the formation of a cyst-like structure. Anal fistulas are typically caused by an abscess or infection in the anal glands.

In rare and severe cases, a pilonidal sinus can cause a fistula, a condition known as pilonidal fistula-in-ano. Treatment for both conditions may involve surgery, and it is essential to seek immediate medical attention if you suspect you have either a pilonidal sinus or an anal fistula.

Comparative Table: Fistula vs Pilonidal Sinus

Here is a table comparing the differences between a fistula and a pilonidal sinus:

Feature Fistula Pilonidal Sinus
Definition A fistula is a disease due to the formation of a passageway inside an infected gland of the anus. A pilonidal sinus is a disease due to the formation of a cyst-like structure that develops along the tailbone, just near the cleft of the buttocks.
Prevalence Fistulas are not specific to any age group or gender. Pilonidal sinuses are more common in young adults and young men are more prone to developing them.
Symptoms Both conditions involve abscesses in the region and can cause drainage and pain. Both conditions involve abscesses in the region and can cause drainage and pain.
Cause Fistulas are typically caused by an infection in a gland, leading to the formation of an abnormal passageway. Pilonidal sinuses are caused by a cyst-like structure that develops along the tailbone and can become infected.
Treatment Treatment for fistulas usually involves surgery to remove the infected gland and the passageway. Treatment for pilonidal sinuses may involve lancing the abscess, draining the infected material, and sometimes surgery to remove the sinus.

Please note that in very rare and severe cases, a pilonidal sinus can cause a fistula, known as pilonidal fistula-in-ano. However, this condition is extremely rare, with only six reported cases.