Pilonidal Sinus: Causes, Symptoms and Treatment
A pilonidal sinus is an inflamed channel or cyst near the tailbone that can cause pain, swelling, and discharge, often requiring surgical treatment.
Things worth knowing about "Pilonidal sinus"
A pilonidal sinus is an inflamed channel or cyst near the tailbone that can cause pain, swelling, and discharge, often requiring surgical treatment.
What is a Pilonidal Sinus?
A pilonidal sinus, also known as a pilonidal cyst or coccygeal fistula, is an inflammatory condition that occurs in the skin near the tailbone (coccyx), at the top of the buttock cleft. It involves a small, abnormal channel or cavity beneath the skin that can fill with pus and become painfully infected. The term “pilonidal” comes from the Latin words for “hair” and “nest,” reflecting the fact that ingrown or embedded hairs are commonly found within these tracts.
Causes
The exact cause of pilonidal sinus is not fully understood, but several risk factors are well established:
- Ingrown hairs: Hairs that penetrate the skin can trigger a foreign body reaction and chronic inflammation.
- Friction and pressure: Prolonged sitting or physical activity that creates repeated pressure on the tailbone area.
- Excessive body hair: People with coarse or dense hair are at higher risk.
- Sweating and poor hygiene: Moisture and inadequate cleaning of the area can contribute.
- Obesity: Excess body weight increases pressure in the gluteal cleft region.
- Male sex: Men are approximately three times more likely to be affected than women.
- Young adult age: The condition most commonly affects people between the ages of 15 and 35.
Symptoms
The symptoms of a pilonidal sinus can range from mild to severe depending on the stage:
- Pain and tenderness in the tailbone area, especially when sitting
- Redness, swelling, and warmth of the overlying skin
- Pus or bloody discharge from a small opening in the skin
- Unpleasant odor from the discharge
- Fever in cases of significant infection
- In chronic cases: recurring episodes of inflammation and multiple sinus tracts
Diagnosis
Diagnosis is typically made through a physical examination. The clinician inspects the sacrococcygeal area for characteristic features such as pits (small skin openings), sinus tracts, and signs of inflammation. In some cases, imaging studies such as ultrasound or MRI (Magnetic Resonance Imaging) may be used to assess the extent of the disease and rule out complications.
Treatment
Conservative Treatment
In mild cases or during acute flare-ups, conservative management may be attempted first:
- Hair removal (shaving or laser epilation) of the affected region to prevent further ingrowth
- Careful hygiene of the natal cleft area
- Antibiotics for accompanying bacterial infection
- Laser hair removal as a supportive long-term measure to reduce recurrence
Surgical Treatment
In recurrent or chronic cases, surgery is usually required. Several surgical approaches are available:
- Incision and drainage: The abscess is opened and drained in an acute setting. This is not a definitive cure.
- Wide excision: The entire sinus tract is surgically removed. The wound may be left open to heal by secondary intention or closed primarily.
- Flap techniques (e.g., Limberg flap, Karydakis flap): Modern reconstructive techniques that shift the closure away from the midline, significantly reducing recurrence rates.
- Minimally invasive procedures (e.g., EPSiT, Video-Assisted Ablation): Newer, less invasive methods with shorter recovery times and favorable outcomes.
Aftercare
Consistent follow-up care after surgery is essential. This includes regular wound checks, ongoing hair removal in the area, and good personal hygiene. The risk of recurrence remains significant if hair regrowth in the region is not controlled long-term.
References
- Iesalnieks I, Ommer A. - The management of pilonidal sinus. Deutsches Arzteblatt International, 2019; 116(1-2): 12-21. DOI: 10.3238/arztebl.2019.0012
- Doll D, Matevossian E, Wietelmann K, Hofer T, Schoffski O, Ninkovic M. - Family history of pilonidal sinus predisposes to earlier onset of disease and a 50% long-term recurrence rate. Diseases of the Colon and Rectum, 2009; 52(9): 1610-1615.
- Steele SR, Perry WB, Mills S, Buie WD. - Practice parameters for the management of pilonidal disease. Diseases of the Colon and Rectum, 2013; 56(9): 1021-1027.
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