Anal fistulas are a distressing condition that can cause persistent pain, discharge, swelling and repeated infections. Many patients experience embarrassment or delay seeking treatment, yet early intervention can prevent long-term complications. Laser anal fistula surgery is a minimally invasive, sphincter-preserving treatment option. This technique offers new hope for patients who want effective treatment with reduced downtime.
This article explain anal fistulas, traditional and laser-based treatments, and the benefits of minimally invasive techniques for suitable patients.
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Understanding Anal Fistula And Why Surgery Is Needed
An anal fistula is an abnormal tunnel that forms between the anal canal and the surrounding skin. Most cases begin as an anal abscess that fails to heal properly, leaving behind a persistent tract. Other causes include inflammatory bowel disease, infections, trauma, and—less commonly—tumours.
Common symptoms include:
- Chronic drainage of pus
- Pain that worsens when sitting
- Redness, swelling or irritation around the anus
- Occasional bleeding
- Recurrent abscesses
Because a fistula rarely heals on its own, surgery is the mainstay of treatment. The goal is to eradicate the entire tract while preserving anal sphincter function to maintain continence. This requires accurate identification of the internal opening and any branching tracts.
Traditional Anal Fistula Surgery Options
Historically, treatment strategies have included:
- Fistulotomy
Cutting open the fistula tract to allow healing from the inside out. Effective for simple, superficial fistulas but risks sphincter division. - Fistulectomy
Removal of the entire tract. More invasive and associated with larger wounds. - Advancement Flaps
Used for complex or high fistulas to close the internal opening while minimising sphincter injury. - LIFT Procedure
A sphincter-preserving method that targets the internal tract between the sphincters.
While effective, these methods can involve wound care, downtime, and varying risks of incontinence depending on fistula complexity.
Laser Anal Fistula Surgery: What Is FiLAC?
Laser closure of fistula tract — commonly known as FiLAC (Fistula-Tract Laser Closure) — represents a modern, minimally invasive approach. The technique, pioneered internationally and adopted by experienced colorectal surgeons in Singapore, uses a laser to shrink and seal the fistula from within.
According to the training slides used by specialist teams, this particular wavelength is strongly absorbed by water in the tissue, achieving:
- Precise ablation
- Effective coagulation
- Minimal thermal spread to surrounding structures
This allows targeted closure of the tract while preserving sphincter muscle integrity.
How FiLAC Is Performed
A typical FiLAC procedure involves:
- Examination Under Anaesthesia (EUA)
The surgeon identifies the internal opening using methods such as hydrogen peroxide testing, methylene blue dye or probing. - Cleaning the Tract
The external opening is widened slightly, and the tract is curetted and irrigated to remove debris and granulation tissue. - Laser Fibre Placement
A feeding tube guides the FiLAC laser fibre along the tract. - Laser Energy Activation
Energy is applied continuously while the surgeon withdraws the fibre slowly—approximately 2–3 seconds per 5 mm.
This controlled, gradual movement ensures uniform sealing. - Internal Opening Closure
The internal opening is typically closed with sutures to prevent recurrence.
This technique may be combined with other methods, such as VAAFT (Video-Assisted Anal Fistula Treatment), depending on fistula complexity.
Benefits Of Laser Anal Fistula Surgery In Singapore
1. Minimally Invasive And Sphincter-Preserving
FiLAC avoids cutting the sphincter muscle, significantly reducing the risk of incontinence. Reported incontinence rates in studies are low (approximately 0.57%), as highlighted in training materials.
2. Less Pain And Smaller Wounds
Because the tract is treated internally, there is no large external wound, leading to reduced postoperative discomfort.
3. Faster Recovery And Shorter Downtime
Most patients resume normal activities more quickly compared to traditional excisional surgeries.
4. Repeatable And Compatible With Other Techniques
If the fistula is complex or recurs, FiLAC can be repeated or paired with complementary minimally invasive techniques such as VAAFT.
5. Preserves Future Treatment Options
Unlike more aggressive surgeries, laser therapy leaves healthy tissue intact, allowing for alternative procedures if required later.
Who Is Suitable For Laser Anal Fistula Surgery?
FiLAC is especially useful for:
- Patients with complex fistulas where sphincter preservation is crucial
- Patients who previously underwent fistula surgery and wish to avoid further sphincter injury
- Individuals who prefer minimally invasive options with less downtime
However, success depends on factors such as fistula anatomy, tract cleanliness, and accurate localisation of the internal opening. In some cases, a staged approach involving a seton may be recommended before FiLAC.
Recovery And Aftercare
After laser fistula surgery:
- Mild discomfort is expected for a few days
- Sitz baths, hygiene, and a high-fibre diet support healing
- Most patients need only short medical leave
- Follow-up visits ensure the tract is closing properly
Adherence to aftercare instructions is essential to reduce recurrence risk.
Our Preferred Doctors (Colorectal Surgeon) For Laser Anal Fistula Surgery
[SG] Featured Doctor- Dr Kevin Koo
Frequently Asked Questions (FAQs)
Laser treatment is ideal for many simple and complex fistulas, especially when sphincter preservation is important. However, extremely high, branching, or horseshoe fistulas may require additional procedures. A colorectal surgeon will assess which method is most suitable.
Studies show success rates around 70% in selected patients. While not a universal solution, FiLAC offers the advantage of low incontinence risk and minimal tissue trauma, making it an attractive option for many.
In cases with active infection, high tracts or significant inflammation, a seton may be placed first to allow drainage. Once conditions are optimal, the laser procedure can be performed.
Get An Appointment With A Colorectal Surgeon
Anal fistula surgery in Singapore has evolved significantly with the introduction of minimally invasive, sphincter-preserving methods like FiLAC. Laser anal fistula surgery offers many patients a safer, gentler alternative with less pain, faster recovery and excellent continence outcomes.
If you are experiencing chronic discharge, recurrent abscesses or symptoms of a fistula, early evaluation by a colorectal specialist can help you understand your options. Modern laser-based treatments may offer the relief and recovery you are looking for.
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