Precision Proctology

FiLaC® Laser Treatment for Anal Fistula in Seattle

An anal fistula can cause persistent drainage, swelling, discomfort, recurrent abscesses, and significant frustration. Treatment can also be complicated because some fistulas pass through the muscles responsible for bowel control.

At Precision Proctology, Dr. Rodney Kratz offers FiLaC® (Fistula-tract Laser Closure), a minimally invasive treatment designed to close selected anal fistulas while preserving the anal sphincter.

FiLaC adds another important option to our comprehensive treatment of anal fistulas. Depending on your individual anatomy, treatment may include fistulotomy, seton placement, FiLaC, LIFT, advancement flap, or a combination of approaches.

The goal is not to use a particular procedure. The goal is to choose the treatment that offers the best balance between healing the fistula and protecting normal bowel control.

Same-day and next-day consultations are available in Seattle.

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What Is FiLaC?

FiLaC stands for Fistula-tract Laser Closure.

It is a minimally invasive, sphincter-preserving procedure used to treat selected anal fistulas from inside the fistula tract.

Instead of cutting open the entire fistula, a thin laser fiber is passed through the existing tract. The fiber delivers controlled laser energy circumferentially as it is slowly withdrawn.

The laser energy treats the tissue lining the fistula tract and causes controlled shrinkage and fibrosis. The objective is for the tract to collapse and progressively heal while avoiding division of the anal sphincter muscles.

Why Is Preserving the Anal Sphincter Important?

The anal sphincter muscles are responsible for maintaining bowel control.

For a superficial fistula involving little or no sphincter muscle, a traditional fistulotomy can be an extremely effective treatment. The fistula is opened and allowed to heal from the inside out.

The situation becomes more complicated when a fistula passes through a significant amount of sphincter muscle.

Simply cutting through that muscle may increase the risk of changes in bowel control.

This is why colorectal surgeons use sphincter-preserving fistula procedures for selected patients.

FiLaC is one of those options.

Who May Be a Candidate for FiLaC?

FiLaC may be considered for selected patients with:

Transsphincteric anal fistulas
Complex anal fistulas
Recurrent fistulas
Fistulas in which fistulotomy would require division of significant sphincter muscle
Previous fistula surgery
Situations in which preservation of sphincter function is particularly important
FiLaC is not automatically the best treatment simply because it is minimally invasive.

For a straightforward superficial fistula, fistulotomy may provide a higher likelihood of definitive healing with very little risk to continence.

The anatomy of the fistula determines the treatment.

What Are the Potential Advantages of FiLaC?

For appropriately selected patients, potential advantages include:

Preservation of the anal sphincter

FiLaC treats the fistula tract without intentionally dividing the sphincter muscle.

Small wounds

Unlike a traditional fistulotomy, the entire tract does not need to be surgically opened.

Less tissue disruption

Treatment is delivered primarily within the existing fistula tract.

Potentially easier recovery

Many patients can return to normal activities relatively quickly, although recovery varies according to fistula complexity and any additional procedures performed.

Future treatment options remain available

If FiLaC does not result in complete healing, other fistula treatments can generally still be performed.

How Successful Is FiLaC?

FiLaC is an important treatment option, but it is not a guaranteed cure.

Published studies report variable healing rates because anal fistulas differ significantly in their anatomy, complexity, previous treatment, and associated infection.

More recent systematic reviews suggest that approximately half to two-thirds of fistulas heal after a primary FiLaC procedure, depending on the type of fistula and patient population studied.

One of the most consistent findings in the published literature is a very low reported rate of new continence problems following FiLaC.

That tradeoff is important.

For some patients with complex fistulas, protecting sphincter function may justify choosing a sphincter-preserving procedure even when another operation might have a higher primary healing rate.

Dr. Kratz will discuss the expected benefits, limitations, alternatives, and likelihood of additional treatment based on your individual fistula anatomy.

FiLaC vs. Fistulotomy

These procedures solve different problems.

Fistulotomy
During fistulotomy, the fistula tract is surgically opened and allowed to heal from the bottom upward.

For appropriately selected superficial fistulas, fistulotomy remains one of the most effective treatments available.

The limitation is that opening a fistula that passes through significant sphincter muscle may require dividing that muscle.

FiLaC
FiLaC treats the tract internally without intentionally cutting through the sphincter.

For that reason, it may be attractive for selected transsphincteric or complex fistulas where sphincter preservation is a priority.

The tradeoff is that FiLaC may have a lower primary healing rate than fistulotomy for simple fistulas.

The question isn't whether FiLaC or fistulotomy is universally better. The question is which procedure is appropriate for your fistula.

FiLaC vs. LIFT

LIFT stands for ligation of the intersphincteric fistula tract.

Both LIFT and FiLaC are designed to treat selected fistulas while avoiding significant injury to the sphincter.

The procedures accomplish this differently.

LIFT involves surgically identifying and dividing the fistula tract in the plane between the internal and external sphincter muscles.

FiLaC treats the fistula from within using a radial laser fiber.

Neither procedure is appropriate for every fistula, and neither guarantees permanent closure.

The decision depends on fistula anatomy, previous operations, branching tracts, active infection, sphincter involvement, and other patient-specific factors.

Do I Need a Seton Before FiLaC?

Sometimes.

A draining seton is a small flexible loop placed through the fistula to maintain drainage and control infection.

If there is an abscess, significant inflammation, or ongoing infection, attempting definitive closure before adequate drainage may be unsuccessful.

In selected patients, Dr. Kratz may recommend a period of seton drainage before FiLaC or another definitive fistula procedure.

Other patients may be able to proceed directly to definitive treatment.

What Happens if FiLaC Doesn't Work?

A fistula that persists after FiLaC can usually still be treated.

Depending on the anatomy, options may include:

Repeat FiLaC
Fistulotomy
Seton placement
LIFT
Advancement flap
Another sphincter-preserving approach
A staged combination of procedures
One advantage of FiLaC is that it generally does not eliminate these future treatment options.

Anal fistulas sometimes require more than one procedure, particularly when they are complex or have already undergone previous treatment.

What Is Recovery Like After FiLaC?

Recovery is generally less disruptive than operations requiring a large surgical wound, although every patient and fistula is different.

Patients may experience drainage, mild bleeding, swelling, or discomfort after treatment.

Dr. Kratz provides specific postoperative instructions and follows patients through healing to determine whether the fistula has completely closed.

Healing is a process rather than an immediate event. Continued drainage early after surgery does not necessarily mean that treatment has failed.

Why Does Anal Fistula Experience Matter?

Anal fistulas can look deceptively simple from the outside.

Under the skin, the tract may pass through the anal sphincter, branch into additional tracts, communicate with an abscess cavity, or follow anatomy that has been altered by previous surgery.

Successful treatment begins with understanding that anatomy.

Dr. Rodney Kratz is a board-certified colon and rectal surgeon whose practice is focused on anorectal disease. He treats anal fistulas using both established surgical techniques and newer minimally invasive approaches.

That means the treatment recommendation is not limited by a single technique.

Fistulotomy when fistulotomy makes sense.

Sphincter-preserving treatment when preserving muscle matters.

Laser when laser is appropriate.

A Personalized Approach to Anal Fistula Treatment

At Precision Proctology, we believe patients should understand their fistula before deciding how to treat it.

Dr. Kratz will evaluate:

Where the fistula begins
Where it exits
How much sphincter muscle it crosses
Whether secondary tracts are present
Whether an abscess or active infection remains
Previous fistula procedures
Existing sphincter function
Your priorities regarding recovery, recurrence, and preservation of bowel control
From there, you can discuss the advantages and disadvantages of each reasonable treatment option.

Frequently Asked Questions About FiLaC

Is FiLaC the same as laser fistula surgery?
FiLaC is a specific form of laser treatment for anal fistulas. A radial laser fiber is passed through the fistula tract and delivers controlled energy to the tract from within.

Does FiLaC cut the anal sphincter?
FiLaC is designed to treat the fistula without intentionally dividing the anal sphincter muscle. This is one of its primary advantages for selected fistulas involving the sphincter.

Is FiLaC better than fistulotomy?
Not necessarily. Fistulotomy remains an excellent treatment for many simple fistulas. FiLaC becomes particularly useful when opening the fistula would require division of meaningful sphincter muscle or when other factors make sphincter preservation important.

Can FiLaC treat a complex anal fistula?
FiLaC is used particularly as a sphincter-preserving option for selected complex fistulas. Complex fistulas vary considerably, however, and some require staged or alternative treatment.

Can FiLaC treat a transsphincteric fistula?
Yes. Transsphincteric fistulas are among the fistulas for which sphincter-preserving approaches such as FiLaC may be considered.

Can FiLaC be performed after a previous fistula operation?
Potentially. Previous surgery does not automatically exclude FiLaC, although recurrent fistulas may have more complicated anatomy and require careful evaluation.

Will I need a seton first?
Some patients do and some do not. A seton may be useful when infection or an abscess needs to be controlled before attempting definitive closure.

Can an anal fistula come back after FiLaC?
Yes. No sphincter-preserving fistula procedure eliminates recurrence. FiLaC can fail to achieve initial closure, or a fistula can recur after appearing to heal.

What happens if FiLaC fails?
Other treatment options generally remain available. Depending on the fistula, these may include repeat FiLaC, fistulotomy, LIFT, advancement flap, seton treatment, or another staged approach.

How do I know which fistula operation I need?
The most important factor is the anatomy of your fistula—particularly its relationship to the anal sphincter. An examination and, when appropriate, imaging or examination under anesthesia can help determine which treatment options offer the best balance of healing and preservation of function.

Anal Fistula Treatment in Seattle

If you have been living with persistent drainage, recurrent abscesses, or an anal fistula, or have been told that your fistula is too complex for a straightforward fistulotomy, you may have additional treatment options.

Precision Proctology offers comprehensive anal fistula treatment, including FiLaC laser fistula closure, fistulotomy, draining setons, LIFT, advancement procedures, and staged fistula treatment.

You don't need to decide which procedure you need before coming in.

That's our job.

The first step is understanding the fistula and discussing your options.

Same-day and next-day consultations are available.

Schedule Consultation Now